diff --git a/autoload/traqvim/command.vim b/autoload/traqvim/command.vim
index 01d5b81..83b7fa4 100644
--- a/autoload/traqvim/command.vim
+++ b/autoload/traqvim/command.vim
@@ -50,14 +50,25 @@ function traqvim#command#channel(args) abort
 	elseif a:args[0] ==# 'reload'
 		call denops#request('traqvim', 'reload', [bufnr(), bufname()])
 	elseif a:args[0] ==# 'forward'
-		call denops#request('traqvim', 'messageForwad', [bufnr(), bufname()])
+		call denops#request('traqvim', 'messageForward', [bufnr(), bufname()])
 	elseif a:args[0] ==# 'back'
 		call denops#request('traqvim', 'messageBack', [bufnr(), bufname()])
 	endif
 endfunction
 
 function traqvim#command#channelComplete(arglead, cmdline) abort
-	if a:cmdline[strlen(a:cmdline)-1] ==# ' ' && len(split(a:cmdline)) >= 3
+	" ['Traq', 'channel', ...]
+	let cmds = split(a:cmdline)
+	" openの場合はチャンネル名を補完
+	if len(cmds) >= 3 && cmds[2] ==# 'open'
+		if len(cmds) == 3
+			return ['#']
+		elseif len(cmds) == 4
+			let channels = denops#request('traqvim', 'channelList', [])
+			return channels->map({_, v -> v['path']})->matchfuzzy(a:arglead)
+		endif
+	endif
+	if a:cmdline[strlen(a:cmdline)-1] ==# ' ' && len(cmds) >= 3
 		return []
 	endif
 	return g:traqvim#command#subcommands.channel.args->copy()->filter({_, v -> v =~? '^' . a:arglead})
diff --git a/denops/traqvim/main.ts b/denops/traqvim/main.ts
index 1f0e97f..a3ba5f3 100644
--- a/denops/traqvim/main.ts
+++ b/denops/traqvim/main.ts
@@ -1,6 +1,7 @@
 import { OAuth } from "./oauth.ts";
 import {
   channelMessageOptions,
+  channelsRecursive,
   channelTimeline,
   channelUUID,
   homeChannelId,
@@ -29,7 +30,7 @@ import {
   actionYankMessageLink,
   actionYankMessageMarkdown,
 } from "./action.ts";
-import { ChannelMessageBuffer, Message } from "./type.d.ts";
+import { Channel, ChannelMessageBuffer, Message } from "./type.d.ts";
 import { api } from "./api.ts";
 import { isMessage } from "./type_check.ts";
 
@@ -378,4 +379,10 @@ export async function main(denops: Denops) {
       return;
     },
   };
+
+  // apiっぽいやつ
+  denops.dispatcher["channelList"] = async (): Promise<Channel[]> => {
+    const channels = await channelsRecursive();
+    return channels;
+  };
 }