diff --git a/chain/src/chain.rs b/chain/src/chain.rs
index f48ad34251..7cc49f75a8 100644
--- a/chain/src/chain.rs
+++ b/chain/src/chain.rs
@@ -53,7 +53,7 @@ pub struct ChainStatusWithBlock {
 }
 impl ChainStatusWithBlock {
     pub fn dag_tips(&self) -> &Option<Vec<HashValue>> {
-        &self.status.tips_hash
+        &self.status.tips_hash()
     }
 }
 pub struct BlockChain {
@@ -1305,7 +1305,7 @@ impl ChainWriter for BlockChain {
             Self::calculate_dag_accumulator_key(
                 self.status
                     .status
-                    .tips_hash
+                    .tips_hash()
                     .as_ref()
                     .expect("dag blocks must have tips")
                     .clone(),
@@ -1334,18 +1334,18 @@ impl ChainWriter for BlockChain {
         );
 
         self.statedb = ChainStateDB::new(self.storage.clone().into_super_arc(), Some(state_root));
-        let tips = self.status.status.tips_hash.clone();
-        let next_tips = match tips {
-            Some(mut tips) => {
-                if !tips.contains(&block.header().id()) {
-                    tips.push(block.header().id());
-                }
-                Some(tips)
-            }
-            None => None,
-        };
+        // let tips = self.status.status.tips_hash.clone();
+        // let next_tips = match tips {
+        //     Some(mut tips) => {
+        //         if !tips.contains(&block.header().id()) {
+        //             tips.push(block.header().id());
+        //         }
+        //         Some(tips)
+        //     }
+        //     None => None,
+        // };
         self.status = ChainStatusWithBlock {
-            status: ChainStatus::new(block.header().clone(), block_info.clone(), next_tips),
+            status: ChainStatus::new(block.header().clone(), block_info.clone(), self.status().tips_hash().clone()),
             head: block.clone(),
         };
         if self.epoch.end_block_number() == block.header().number() {
@@ -1369,7 +1369,7 @@ impl ChainWriter for BlockChain {
     }
 
     fn update_tips(&mut self, new_tips: Vec<HashValue>) -> Result<()> {
-        self.status.status.tips_hash = Some(new_tips);
+        self.status.status.update_tips(Some(new_tips));
         Ok(())
     }
 }
diff --git a/chain/src/verifier/mod.rs b/chain/src/verifier/mod.rs
index ce54de696b..e3173779da 100644
--- a/chain/src/verifier/mod.rs
+++ b/chain/src/verifier/mod.rs
@@ -198,9 +198,9 @@ impl BlockVerifier for BasicVerifier {
         // todo: For a dag block
         // 1. It could be the first dag block, the chain is just a normal single chain
         // 2. Or, both block and dag are created for flexidag
-        if chain_status.tips_hash.is_some() {
+        if chain_status.tips_hash().is_some() {
             // todo: make sure current block is a dag block
-            let mut tips_hash = chain_status.tips_hash.clone().unwrap();
+            let mut tips_hash = chain_status.tips_hash().clone().unwrap();
             tips_hash.sort();
 
             // if it is a dag block
diff --git a/consensus/src/consensusdb/consensus_ghostdag.rs b/consensus/src/consensusdb/consensus_ghostdag.rs
index ca99a0b8ea..f0cb7758f5 100644
--- a/consensus/src/consensusdb/consensus_ghostdag.rs
+++ b/consensus/src/consensusdb/consensus_ghostdag.rs
@@ -6,6 +6,7 @@ use super::{
     writer::BatchDbWriter,
 };
 use crate::define_schema;
+use starcoin_logger::prelude::info;
 use starcoin_types::blockhash::{
     BlockHashMap, BlockHashes, BlockLevel, BlueWorkType, HashKTypeMap,
 };
diff --git a/consensus/src/dag/blockdag.rs b/consensus/src/dag/blockdag.rs
index 744dad1d1d..1310bbf6e9 100644
--- a/consensus/src/dag/blockdag.rs
+++ b/consensus/src/dag/blockdag.rs
@@ -19,6 +19,7 @@ use starcoin_accumulator::node::AccumulatorStoreType;
 use starcoin_accumulator::{Accumulator, MerkleAccumulator};
 use starcoin_config::{ChainNetworkID, NodeConfig, RocksdbConfig};
 use starcoin_crypto::{HashValue as Hash, HashValue};
+use starcoin_logger::prelude::info;
 use starcoin_storage::flexi_dag::SyncFlexiDagSnapshotHasher;
 use starcoin_storage::storage::CodecKVStore;
 use starcoin_storage::Store;
diff --git a/miner/src/create_block_template/mod.rs b/miner/src/create_block_template/mod.rs
index 539b19b050..511a7a7ea0 100644
--- a/miner/src/create_block_template/mod.rs
+++ b/miner/src/create_block_template/mod.rs
@@ -27,6 +27,7 @@ use starcoin_types::{
     system_events::{NewBranch, NewHeadBlock},
 };
 use starcoin_vm_types::transaction::SignedUserTransaction;
+use std::backtrace::Backtrace;
 use std::cmp::min;
 use std::{collections::HashMap, sync::Arc};
 
@@ -375,7 +376,7 @@ where
         let epoch = self.chain.epoch();
         let strategy = epoch.strategy();
         let difficulty = strategy.calculate_next_difficulty(&self.chain)?;
-        let tips_hash = self.chain.status().tips_hash;
+        let tips_hash = self.chain.status().tips_hash().clone();
         let (uncles, blue_blocks) = {
             match &tips_hash {
                 None => (self.find_uncles(), None),
@@ -384,10 +385,8 @@ where
                         let mut blues = dag.ghostdata(tips).mergeset_blues.to_vec();
                         assert!(blues.len() > 0, "the count of the blue block should be larger than 0");
                         let mut blue_blocks = vec![];
-                        if !self.is_dag_genesis(blues[0])? {
-                            let selected_parent = blues.remove(0);
-                            assert_eq!(previous_header.id(), selected_parent);
-                        }
+                        let selected_parent = blues.remove(0); // 5
+                        // assert_eq!(previous_header.id(), selected_parent);// 4, 5
                         for blue in &blues {
                             let block = self
                                 .storage
@@ -409,6 +408,7 @@ where
                 }
             }
         };
+
         info!(
             "[CreateBlockTemplate] previous_header: {:?}, block_gas_limit: {}, max_txns: {}, txn len: {}, uncles len: {}, timestamp: {}",
             previous_header,
@@ -434,7 +434,6 @@ where
         )?;
 
         let excluded_txns = opened_block.push_txns(txns)?;
-
         let template = opened_block.finalize()?;
         for invalid_txn in excluded_txns.discarded_txns {
             self.tx_provider.remove_invalid_txn(invalid_txn.id());
diff --git a/miner/src/task.rs b/miner/src/task.rs
index ac42091d47..e0b0f56f05 100644
--- a/miner/src/task.rs
+++ b/miner/src/task.rs
@@ -3,6 +3,7 @@
 
 use crate::metrics::MinerMetrics;
 use crate::BlockHeaderExtra;
+use starcoin_logger::prelude::info;
 use starcoin_metrics::HistogramTimer;
 use starcoin_types::block::{Block, BlockTemplate};
 
diff --git a/sync/src/block_connector/write_block_chain.rs b/sync/src/block_connector/write_block_chain.rs
index d093770d69..bcfd44f1da 100644
--- a/sync/src/block_connector/write_block_chain.rs
+++ b/sync/src/block_connector/write_block_chain.rs
@@ -107,7 +107,6 @@ where
             .map(|metrics| metrics.chain_block_connect_time.start_timer());
 
         let result = self.connect_inner(block.clone());
-
         if let Some(metrics) = self.metrics.as_ref() {
             let result = match result.as_ref() {
                 std::result::Result::Ok(connect) => format!("Ok_{}", connect),
@@ -265,7 +264,7 @@ where
             self.update_startup_info(new_branch.head_block().header())?;
             ctx.broadcast(NewHeadBlock {
                 executed_block: Arc::new(new_branch.head_block()),
-                tips: self.main.status().tips_hash.clone(),
+                // tips: self.main.status().tips_hash.clone(),
             });
             Ok(())
         } else {
@@ -516,7 +515,7 @@ where
 
         if let Err(e) = self.bus.broadcast(NewHeadBlock {
             executed_block: Arc::new(block),
-            tips: self.main.status().tips_hash.clone(),
+            // tips: self.main.status().tips_hash.clone(),
         }) {
             error!("Broadcast NewHeadBlock error: {:?}", e);
         }
@@ -535,9 +534,10 @@ where
     }
 
     pub fn update_tips(&mut self, block_header: BlockHeader) -> Result<()> {
-        self.main.status().tips_hash.map(|mut tips| {
+        self.main.status().tips_hash().clone().map(|mut tips| {
             if !tips.contains(&block_header.id()) {
-                tips.push(block_header.id())
+                tips.push(block_header.id());
+                self.main.status().update_tips(Some(tips));
             }
         });
         async_std::task::block_on(self.flexidag_service.send(UpdateDagTips {
@@ -551,10 +551,7 @@ where
     }
 
     pub fn dump_tips(&mut self, block_header: BlockHeader) -> Result<()> {
-        self.main.status().tips_hash.map(|mut tips| {
-            tips.clear();
-            tips.push(block_header.id());
-        });
+        self.main.status().update_tips(Some(vec![block_header.id()]));
         async_std::task::block_on(self.flexidag_service.send(DumpTipsToAccumulator {
             block_header: block_header.clone(),
             current_head_block_id: self.main.status().head().id(),
@@ -579,6 +576,7 @@ where
             return Ok(ConnectOk::MainDuplicate);
         }
 
+
         let parent_hash = block.parent_hash()?;
 
         if self.main.current_header().id() == parent_hash && !self.block_exist(block_id)? {
diff --git a/sync/src/sync.rs b/sync/src/sync.rs
index 3bfc080c33..1934e4cbcb 100644
--- a/sync/src/sync.rs
+++ b/sync/src/sync.rs
@@ -718,7 +718,7 @@ impl EventHandler<Self, NewHeadBlock> for SyncService {
         if self.sync_status.update_chain_status(ChainStatus::new(
             msg.executed_block.header().clone(),
             msg.executed_block.block_info.clone(),
-            msg.tips,
+            self.sync_status.chain_status().tips_hash().clone(),
         )) {
             self.sync_status.update_dag_accumulator_info(
                 self.storage
diff --git a/types/src/block.rs b/types/src/block.rs
index 624138d8cc..5ef975ba9e 100644
--- a/types/src/block.rs
+++ b/types/src/block.rs
@@ -774,13 +774,13 @@ impl Block {
     // }
 
     pub fn parent_hash(&self) -> anyhow::Result<HashValue> {
-        if self.header().parents_hash.is_some() {
-            self.dag_parent_and_tips()
-                .map(|dag| dag.0.id())
-                .ok_or_else(|| format_err!("missing parent and tips for dag block"))
-        } else {
+        // if self.header().parents_hash.is_some() {
+        //     self.dag_parent_and_tips()
+        //         .map(|dag| dag.0.id())
+        //         .ok_or_else(|| format_err!("missing parent and tips for dag block"))
+        // } else {
             Ok(self.header().parent_hash())
-        }
+        // }
     }
 
     pub fn id(&self) -> HashValue {
diff --git a/types/src/startup_info.rs b/types/src/startup_info.rs
index 664017c6da..156edf1f82 100644
--- a/types/src/startup_info.rs
+++ b/types/src/startup_info.rs
@@ -133,7 +133,7 @@ pub struct ChainStatus {
     /// Chain block info
     pub info: BlockInfo,
     /// tips
-    pub tips_hash:Option<Vec<HashValue>>
+    tips_hash:Option<Vec<HashValue>>
 }
 
 impl ChainStatus {
@@ -174,6 +174,10 @@ impl ChainStatus {
         &self.info
     }
 
+    pub fn tips_hash(&self) -> &Option<Vec<HashValue>> {
+        &self.tips_hash
+    }
+
     pub fn total_difficulty(&self) -> U256 {
         self.info.total_difficulty
     }
@@ -181,6 +185,10 @@ impl ChainStatus {
     pub fn into_inner(self) -> (BlockHeader, BlockInfo) {
         (self.head, self.info)
     }
+
+    pub fn update_tips(&mut self, tips: Option<Vec<HashValue>>) {
+        self.tips_hash = tips;
+    }
 }
 
 impl Sample for ChainStatus {
diff --git a/types/src/system_events.rs b/types/src/system_events.rs
index a52cf009c3..138a3948c6 100644
--- a/types/src/system_events.rs
+++ b/types/src/system_events.rs
@@ -12,7 +12,7 @@ use std::sync::Arc;
 #[derive(Clone, Debug)]
 pub struct NewHeadBlock {
     pub executed_block: Arc<ExecutedBlock>,
-    pub tips: Option<Vec<HashValue>>,
+    // pub tips: Option<Vec<HashValue>>,
 }
 
 /// may be uncle block
diff --git a/vm/starcoin-transactional-test-harness/src/fork_chain.rs b/vm/starcoin-transactional-test-harness/src/fork_chain.rs
index 03f6781d9f..b40abdd81f 100644
--- a/vm/starcoin-transactional-test-harness/src/fork_chain.rs
+++ b/vm/starcoin-transactional-test-harness/src/fork_chain.rs
@@ -118,7 +118,7 @@ impl ForkBlockChain {
         let tips = self
             .status
             .as_ref()
-            .and_then(|status| status.status.tips_hash.clone());
+            .and_then(|status| status.status.tips_hash().clone());
         let parents = block.header.parents_hash();
         match (tips, parents) {
             (Some(mut tips), Some(parents)) => {