diff --git a/core/state_processor.go b/core/state_processor.go
index 0d84bbea51f7..e60e3c9096c3 100644
--- a/core/state_processor.go
+++ b/core/state_processor.go
@@ -93,6 +93,7 @@ func (p *StateProcessor) Process(block *types.Block, statedb *state.StateDB, cfg
 }
 
 func applyTransaction(msg types.Message, config *params.ChainConfig, author *common.Address, gp *GasPool, statedb *state.StateDB, blockNumber *big.Int, blockHash common.Hash, tx *types.Transaction, usedGas *uint64, evm *vm.EVM) (*types.Receipt, error) {
+	// check eip155 sign after EthPow block
 	if config.IsEthPoWFork(blockNumber) && !tx.Protected() {
 		return nil, types.ErrUnexpectedProtection
 	}
diff --git a/internal/ethapi/api.go b/internal/ethapi/api.go
index 939dd69396f3..d8d47521e1cf 100644
--- a/internal/ethapi/api.go
+++ b/internal/ethapi/api.go
@@ -731,10 +731,10 @@ func (s *BlockChainAPI) GetHeaderByHash(ctx context.Context, hash common.Hash) m
 }
 
 // GetBlockByNumber returns the requested canonical block.
-// * When blockNr is -1 the chain head is returned.
-// * When blockNr is -2 the pending chain head is returned.
-// * When fullTx is true all transactions in the block are returned, otherwise
-//   only the transaction hash is returned.
+//   - When blockNr is -1 the chain head is returned.
+//   - When blockNr is -2 the pending chain head is returned.
+//   - When fullTx is true all transactions in the block are returned, otherwise
+//     only the transaction hash is returned.
 func (s *BlockChainAPI) GetBlockByNumber(ctx context.Context, number rpc.BlockNumber, fullTx bool) (map[string]interface{}, error) {
 	block, err := s.b.BlockByNumber(ctx, number)
 	if block != nil && err == nil {
@@ -1660,6 +1660,10 @@ func SubmitTransaction(ctx context.Context, b Backend, tx *types.Transaction) (c
 		// Ensure only eip155 signed transactions are submitted if EIP155Required is set.
 		return common.Hash{}, errors.New("only replay-protected (EIP-155) transactions allowed over RPC")
 	}
+	// check eip155 sign after EthPow block
+	if b.ChainConfig().IsEthPoWFork(b.CurrentBlock().Number()) && !tx.Protected() {
+		return common.Hash{}, types.ErrUnexpectedProtection
+	}
 	if err := b.SendTx(ctx, tx); err != nil {
 		return common.Hash{}, err
 	}