diff --git a/README.md b/README.md
index 766f6b0..50ec3ee 100644
--- a/README.md
+++ b/README.md
@@ -382,6 +382,8 @@ wechat:
 
 在单条规则中可以使用 `fullMatch` 来设置字符匹配规则，`true` 表示使用完全匹配(full match)，`false` 表示使用包含匹配(partial match)，不设置该项则默认使用包含匹配。
 
+在单条规则中可以使用 `tag` 来设置流水的 [Tag](https://beancount.github.io/docs/beancount_language_syntax.html#tags)，使用 `sep` 作为分隔符。
+
 匹配成功则使用规则中定义的 `targetAccount` 、 `methodAccount` 等账户覆盖默认定义账户。
 
 规则匹配的顺序是：从 `rules` 配置中的第一条开始匹配，如果匹配成功仍继续匹配。也就是后面的规则优先级要**高于**前面的规则。
diff --git a/example/wechat/config.yaml b/example/wechat/config.yaml
index a14d9c3..fcf5973 100644
--- a/example/wechat/config.yaml
+++ b/example/wechat/config.yaml
@@ -51,6 +51,7 @@ wechat:
     - peer: 用户
       type: 收入
       targetAccount: Income:Service
+      tag: income,service
 
     - peer: 理财通
       type: /
diff --git a/example/wechat/example-wechat-output.beancount b/example/wechat/example-wechat-output.beancount
index 1f154e3..97c9281 100644
--- a/example/wechat/example-wechat-output.beancount
+++ b/example/wechat/example-wechat-output.beancount
@@ -102,7 +102,7 @@ option "operating_currency" "CNY"
 	Assets:Bank:CN:ICBC:Savings 5505.00 CNY
 	Assets:Digital:Wechat:Cash -5505.00 CNY
 
-2020-11-27 * "用户A" "收款方备注:二维码收款"
+2020-11-27 * "用户A" "收款方备注:二维码收款" #income #service
 	merchantId: "/"
 	method: "零钱"
 	orderId: "3985734"
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..96e4296
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,43 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1659877975,
+        "narHash": "sha256-zllb8aq3YO3h8B/U0/J1WBgAL8EX5yWf5pMj3G0NAmc=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "c0e246b9b83f637f4681389ecabcb2681b4f3af0",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1663761423,
+        "narHash": "sha256-bDLXl2BVq7eIQz/8CduZI1SLyhG9u/CrckHd6f7bwPE=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "d6490a0bd9dfb298fcd8382d3363b86870dc7340",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..bacfea3
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,45 @@
+{
+  description = "Rule-based double-entry bookkeeping importer (from Alipay/WeChat/Huobi to Beancount)";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = {
+    self,
+    nixpkgs,
+    flake-utils,
+    ...
+  }:
+    flake-utils.lib.eachDefaultSystem
+    (
+      system: let
+        pkgs = import nixpkgs {
+          inherit system;
+        };
+        buildDeps = with pkgs; [git go_1_19 gnumake];
+        devDeps = with pkgs;
+          buildDeps
+          ++ [
+            golangci-lint
+          ];
+      in rec {
+        # `nix develop`
+        devShell = pkgs.mkShell {buildInputs = devDeps;};
+        checks = {
+          format =
+            pkgs.runCommand "check-format"
+            {
+              buildInputs = with pkgs; [
+                nixpkgs-fmt
+                golangci-lint
+              ];
+            } ''
+              ${pkgs.nixpkgs-fmt}/bin/nixpkgs-fmt ${./.}
+              ${pkgs.golangci-lint}/bin/golangci-lint run --fix --timeout 10m ${./.}
+            '';
+        };
+      }
+    );
+}
diff --git a/pkg/analyser/alipay/alipay.go b/pkg/analyser/alipay/alipay.go
index 77c2725..6fda4f4 100644
--- a/pkg/analyser/alipay/alipay.go
+++ b/pkg/analyser/alipay/alipay.go
@@ -38,14 +38,15 @@ func (a Alipay) GetAllCandidateAccounts(cfg *config.Config) map[string]bool {
 }
 
 // GetAccounts returns minus and plus account.
-func (a Alipay) GetAccounts(o *ir.Order, cfg *config.Config, target, provider string) (string, string, map[ir.Account]string) {
+func (a Alipay) GetAccountsAndTags(o *ir.Order, cfg *config.Config, target, provider string) (string, string, map[ir.Account]string, []string) {
 
 	if cfg.Alipay == nil || len(cfg.Alipay.Rules) == 0 {
-		return cfg.DefaultMinusAccount, cfg.DefaultPlusAccount, nil
+		return cfg.DefaultMinusAccount, cfg.DefaultPlusAccount, nil, nil
 	}
 	resMinus := cfg.DefaultMinusAccount
 	resPlus := cfg.DefaultPlusAccount
 	var extraAccounts map[ir.Account]string
+	var tags = make([]string, 0)
 
 	var err error
 	for _, r := range cfg.Alipay.Rules {
@@ -112,11 +113,15 @@ func (a Alipay) GetAccounts(o *ir.Order, cfg *config.Config, target, provider st
 				}
 			}
 
+			if r.Tags != nil {
+				tags = strings.Split(*r.Tags, sep)
+			}
+
 		}
 	}
 
 	if strings.HasPrefix(o.Item, "退款-") {
-		return resPlus, resMinus, extraAccounts
+		return resPlus, resMinus, extraAccounts, tags
 	}
-	return resMinus, resPlus, extraAccounts
+	return resMinus, resPlus, extraAccounts, tags
 }
diff --git a/pkg/analyser/htsec/htsec.go b/pkg/analyser/htsec/htsec.go
index 771ebb1..7158341 100644
--- a/pkg/analyser/htsec/htsec.go
+++ b/pkg/analyser/htsec/htsec.go
@@ -40,14 +40,14 @@ func (h Htsec) GetAllCandidateAccounts(cfg *config.Config) map[string]bool {
 	return uniqMap
 }
 
-func (h Htsec) GetAccounts(o *ir.Order, cfg *config.Config, target, provider string) (string, string, map[ir.Account]string) {
+func (h Htsec) GetAccountsAndTags(o *ir.Order, cfg *config.Config, target, provider string) (string, string, map[ir.Account]string, []string) {
 	if cfg.Htsec == nil || len(cfg.Htsec.Rules) == 0 {
 		return "", "", map[ir.Account]string{
 			ir.CashAccount:       cfg.DefaultCashAccount,
 			ir.PositionAccount:   cfg.DefaultPositionAccount,
 			ir.CommissionAccount: cfg.DefaultCommissionAccount,
 			ir.PnlAccount:        cfg.DefaultPnlAccount,
-		}
+		}, nil
 	}
 
 	cashAccount := cfg.DefaultCashAccount
@@ -101,6 +101,7 @@ func (h Htsec) GetAccounts(o *ir.Order, cfg *config.Config, target, provider str
 			if r.PnlAccount != nil {
 				pnlAccount = *r.PnlAccount
 			}
+
 		}
 	}
 
@@ -109,5 +110,5 @@ func (h Htsec) GetAccounts(o *ir.Order, cfg *config.Config, target, provider str
 		ir.PositionAccount:   positionAccount,
 		ir.CommissionAccount: commissionAccount,
 		ir.PnlAccount:        pnlAccount,
-	}
+	}, nil
 }
diff --git a/pkg/analyser/huobi/huobi.go b/pkg/analyser/huobi/huobi.go
index 81d8043..1b01124 100644
--- a/pkg/analyser/huobi/huobi.go
+++ b/pkg/analyser/huobi/huobi.go
@@ -40,14 +40,14 @@ func (h Huobi) GetAllCandidateAccounts(cfg *config.Config) map[string]bool {
 	return uniqMap
 }
 
-func (h Huobi) GetAccounts(o *ir.Order, cfg *config.Config, target, provider string) (string, string, map[ir.Account]string) {
+func (h Huobi) GetAccountsAndTags(o *ir.Order, cfg *config.Config, target, provider string) (string, string, map[ir.Account]string, []string) {
 	if cfg.Huobi == nil || len(cfg.Huobi.Rules) == 0 {
 		return "", "", map[ir.Account]string{
 			ir.CashAccount:       cfg.DefaultCashAccount,
 			ir.PositionAccount:   cfg.DefaultPositionAccount,
 			ir.CommissionAccount: cfg.DefaultCommissionAccount,
 			ir.PnlAccount:        cfg.DefaultPnlAccount,
-		}
+		}, nil
 	}
 
 	cashAccount := cfg.DefaultCashAccount
@@ -111,5 +111,5 @@ func (h Huobi) GetAccounts(o *ir.Order, cfg *config.Config, target, provider str
 		ir.PositionAccount:   positionAccount,
 		ir.CommissionAccount: commissionAccount,
 		ir.PnlAccount:        pnlAccount,
-	}
+	}, nil
 }
diff --git a/pkg/analyser/interface.go b/pkg/analyser/interface.go
index d21be03..f5ef787 100644
--- a/pkg/analyser/interface.go
+++ b/pkg/analyser/interface.go
@@ -2,6 +2,7 @@ package analyser
 
 import (
 	"fmt"
+
 	"github.com/deb-sig/double-entry-generator/pkg/analyser/alipay"
 	"github.com/deb-sig/double-entry-generator/pkg/analyser/htsec"
 	"github.com/deb-sig/double-entry-generator/pkg/analyser/huobi"
@@ -14,7 +15,7 @@ import (
 // Interface is the interface of analyser.
 type Interface interface {
 	GetAllCandidateAccounts(cfg *config.Config) map[string]bool
-	GetAccounts(o *ir.Order, cfg *config.Config, target, provider string) (string, string, map[ir.Account]string)
+	GetAccountsAndTags(o *ir.Order, cfg *config.Config, target, provider string) (string, string, map[ir.Account]string, []string)
 }
 
 // New creates a new analyser.
diff --git a/pkg/analyser/wechat/wechat.go b/pkg/analyser/wechat/wechat.go
index f6d454e..a568b47 100644
--- a/pkg/analyser/wechat/wechat.go
+++ b/pkg/analyser/wechat/wechat.go
@@ -2,6 +2,7 @@ package wechat
 
 import (
 	"log"
+	"strings"
 
 	"github.com/deb-sig/double-entry-generator/pkg/config"
 	"github.com/deb-sig/double-entry-generator/pkg/ir"
@@ -37,8 +38,10 @@ func (w Wechat) GetAllCandidateAccounts(cfg *config.Config) map[string]bool {
 }
 
 // GetAccounts returns minus and plus account.
-func (w Wechat) GetAccounts(o *ir.Order, cfg *config.Config, target, provider string) (string, string, map[ir.Account]string) {
+func (w Wechat) GetAccountsAndTags(o *ir.Order, cfg *config.Config, target, provider string) (string, string, map[ir.Account]string, []string) {
 	var resCommission string
+	var tags = make([]string, 0)
+
 	// check this tx whether has commission
 	if o.Commission != 0 {
 		if cfg.DefaultCommissionAccount == "" {
@@ -51,7 +54,7 @@ func (w Wechat) GetAccounts(o *ir.Order, cfg *config.Config, target, provider st
 	if cfg.Wechat == nil || len(cfg.Wechat.Rules) == 0 {
 		return cfg.DefaultMinusAccount, cfg.DefaultPlusAccount, map[ir.Account]string{
 			ir.CommissionAccount: resCommission,
-		}
+		}, nil
 	}
 
 	resMinus := cfg.DefaultMinusAccount
@@ -62,6 +65,7 @@ func (w Wechat) GetAccounts(o *ir.Order, cfg *config.Config, target, provider st
 		match := true
 		// get seperator
 		sep := ","
+
 		if r.Seperator != nil {
 			sep = *r.Seperator
 		}
@@ -118,11 +122,16 @@ func (w Wechat) GetAccounts(o *ir.Order, cfg *config.Config, target, provider st
 			if r.CommissionAccount != nil {
 				resCommission = *r.CommissionAccount
 			}
+
+			if r.Tag != nil {
+				tags = strings.Split(*r.Tag, sep)
+			}
+
 		}
 
 	}
 
 	return resMinus, resPlus, map[ir.Account]string{
 		ir.CommissionAccount: resCommission,
-	}
+	}, tags
 }
diff --git a/pkg/compiler/beancount/compiler.go b/pkg/compiler/beancount/compiler.go
index a89f051..60e095e 100644
--- a/pkg/compiler/beancount/compiler.go
+++ b/pkg/compiler/beancount/compiler.go
@@ -87,10 +87,11 @@ func (b *BeanCount) Compile() error {
 	log.Printf("Getting the expected account for the bills")
 	for index, o := range b.IR.Orders {
 		// Get the expected accounts according to the configuration.
-		minusAccount, plusAccount, extraAccounts := b.GetAccounts(&o, b.Config, b.Provider, b.Target)
+		minusAccount, plusAccount, extraAccounts, tags := b.GetAccountsAndTags(&o, b.Config, b.Provider, b.Target)
 		b.IR.Orders[index].MinusAccount = minusAccount
 		b.IR.Orders[index].PlusAccount = plusAccount
 		b.IR.Orders[index].ExtraAccounts = extraAccounts
+		b.IR.Orders[index].Tags = tags
 	}
 
 	log.Printf("Writing to %s", b.Output)
@@ -185,6 +186,7 @@ func (b *BeanCount) writeBill(file *os.File, index int) error {
 			CommissionAccount: o.ExtraAccounts[ir.CommissionAccount],
 			Metadata:          o.Metadata,
 			Currency:          b.Config.DefaultCurrency,
+			Tags:              o.Tags,
 		})
 	case ir.OrderTypeHuobiTrade: // Huobi trades
 		switch o.TxType {
diff --git a/pkg/compiler/beancount/template.go b/pkg/compiler/beancount/template.go
index de00ce5..9a0f312 100644
--- a/pkg/compiler/beancount/template.go
+++ b/pkg/compiler/beancount/template.go
@@ -6,7 +6,7 @@ import (
 )
 
 // 普通账单的模版（消费账）
-var normalOrder = `{{ .PayTime.Format "2006-01-02" }} * "{{ EscapeString .Peer }}" "{{ EscapeString .Item }}"{{ if .Note }}  ; {{ .Note }}{{ end }}
+var normalOrder = `{{ .PayTime.Format "2006-01-02" }} * "{{ EscapeString .Peer }}" "{{ EscapeString .Item }}"{{ range .Tags }} #{{ . }}{{ end }}{{ if .Note }} ; {{ .Note }}{{ end }}
 	{{- range $key, $value := .Metadata }}{{ if $value }}{{ printf "\n" }}	{{ $key }}: "{{ $value }}"{{end}}{{end}}
 	{{ .PlusAccount }} {{ .Money | printf "%.2f" }} {{ .Currency }}
 	{{ .MinusAccount }} -{{ .Money | printf "%.2f" }} {{ .Currency }}
@@ -29,6 +29,7 @@ type NormalOrderVars struct {
 	CommissionAccount string
 	Currency          string
 	Metadata          map[string]string // unordered metadata map
+	Tags              []string
 }
 
 // 火币买入模版（手续费单位为购买单位货币）
diff --git a/pkg/config/config.go b/pkg/config/config.go
index 8ee7f45..d972ded 100644
--- a/pkg/config/config.go
+++ b/pkg/config/config.go
@@ -12,13 +12,13 @@ type Config struct {
 	Title                    string         `yaml:"title,omitempty"`
 	DefaultMinusAccount      string         `yaml:"defaultMinusAccount,omitempty"`
 	DefaultPlusAccount       string         `yaml:"defaultPlusAccount,omitempty"`
-	DefaultCashAccount       string         `yaml:"defaultCashAccount,omitempty`
-	DefaultPositionAccount   string         `yaml:"defaultPositionAccount,omitempty`
-	DefaultCommissionAccount string         `yaml:"defaultCommissionAccount,omitempty`
-	DefaultPnlAccount        string         `yaml:"defaultPnlAccount,omitempty`
+	DefaultCashAccount       string         `yaml:"defaultCashAccount,omitempty"`
+	DefaultPositionAccount   string         `yaml:"defaultPositionAccount,omitempty"`
+	DefaultCommissionAccount string         `yaml:"defaultCommissionAccount,omitempty"`
+	DefaultPnlAccount        string         `yaml:"defaultPnlAccount,omitempty"`
 	DefaultCurrency          string         `yaml:"defaultCurrency,omitempty"`
 	Alipay                   *alipay.Config `yaml:"alipay,omitempty"`
 	Wechat                   *wechat.Config `yaml:"wechat,omitempty"`
-	Huobi                    *huobi.Config  `yaml:"huobi,omitempty`
-	Htsec                    *htsec.Config  `yaml:"htsec,omitempty""`
+	Huobi                    *huobi.Config  `yaml:"huobi,omitempty"`
+	Htsec                    *htsec.Config  `yaml:"htsec,omitempty"`
 }
diff --git a/pkg/ir/ir.go b/pkg/ir/ir.go
index a2ac873..60a526e 100644
--- a/pkg/ir/ir.go
+++ b/pkg/ir/ir.go
@@ -49,6 +49,7 @@ type Order struct {
 	MinusAccount    string
 	PlusAccount     string
 	Metadata        map[string]string
+	Tags            []string
 }
 
 // Unit is the key commodity names
diff --git a/pkg/provider/alipay/config.go b/pkg/provider/alipay/config.go
index f7e3f1b..50f2020 100644
--- a/pkg/provider/alipay/config.go
+++ b/pkg/provider/alipay/config.go
@@ -35,4 +35,5 @@ type Rule struct {
 	TargetAccount  *string `mapstructure:"targetAccount,omitempty"`
 	PnlAccount     *string `mapstructure:"pnlAccount,omitempty"`
 	FullMatch      bool    `mapstructure:"fullMatch,omitempty"`
+	Tags           *string `mapstructure:"tags,omitempty"`
 }
diff --git a/pkg/provider/interface.go b/pkg/provider/interface.go
index 5fb3664..3432e1d 100644
--- a/pkg/provider/interface.go
+++ b/pkg/provider/interface.go
@@ -18,6 +18,7 @@ package provider
 
 import (
 	"fmt"
+
 	"github.com/deb-sig/double-entry-generator/pkg/consts"
 	"github.com/deb-sig/double-entry-generator/pkg/ir"
 	"github.com/deb-sig/double-entry-generator/pkg/provider/alipay"
diff --git a/pkg/provider/wechat/config.go b/pkg/provider/wechat/config.go
index 37a65cc..211ef24 100644
--- a/pkg/provider/wechat/config.go
+++ b/pkg/provider/wechat/config.go
@@ -35,4 +35,5 @@ type Rule struct {
 	TargetAccount     *string `mapstructure:"targetAccount,omitempty"`
 	CommissionAccount *string `mapstructure:"commissionAccount,omitempty"`
 	FullMatch         bool    `mapstructure:"fullMatch,omitempty"`
+	Tag               *string `mapstructure:"tag,omitempty"`
 }