diff --git a/core/blockchain.go b/core/blockchain.go
index 71ae310e66..c43b7a9f69 100644
--- a/core/blockchain.go
+++ b/core/blockchain.go
@@ -1913,6 +1913,8 @@ func (bc *BlockChain) insertChain(chain types.Blocks, setHead bool) (int, error)
 					log.Debug("Disable Parallel Tx execution", "block", block.NumberU64(), "transactions", txsCount, "parallelTxNum", bc.vmConfig.ParallelTxNum)
 				} else {
 					bc.UseParallelProcessor()
+					log.Debug("Enable Parallel Tx execution", "block", block.NumberU64(), "transactions", txsCount, "parallelTxNum", bc.vmConfig.ParallelTxNum)
+
 				}
 			}
 			// If we have a followup block, run that against the current state to pre-cache
diff --git a/core/state/parallel_statedb.go b/core/state/parallel_statedb.go
index 46253d5cec..1d9a7bf0ae 100644
--- a/core/state/parallel_statedb.go
+++ b/core/state/parallel_statedb.go
@@ -139,6 +139,11 @@ func NewSlotDB(db *StateDB, txIndex int, baseTxIndex int, manager *ParallelDBMan
 }
 
 func (s *ParallelStateDB) PutSyncPool(parallelDBManager *ParallelDBManager) {
+	for key := range s.parallel.locatStateObjects {
+		delete(s.parallel.locatStateObjects, key)
+	}
+	addressToStateObjectsPool.Put(s.parallel.locatStateObjects)
+
 	for key := range s.parallel.codeReadsInSlot {
 		delete(s.parallel.codeReadsInSlot, key)
 	}
@@ -266,7 +271,7 @@ func (s *ParallelStateDB) getStateObject(addr common.Address) *stateObject {
 func (s *ParallelStateDB) storeStateObj(addr common.Address, stateObject *stateObject) {
 	// The object could be created in SlotDB, if it got the object from DB and
 	// update it to the `s.parallel.stateObjects`
-	s.parallel.stateObjects.Store(addr, stateObject)
+	s.parallel.locatStateObjects[addr] = stateObject
 }
 
 func (s *ParallelStateDB) getStateObjectNoSlot(addr common.Address) *stateObject {
@@ -1860,7 +1865,8 @@ func (s *ParallelStateDB) reset() {
 
 	s.parallel.isSlotDB = true
 	s.parallel.SlotIndex = -1
-	s.parallel.stateObjects = &StateObjectSyncMap{}
+	s.parallel.stateObjects = nil
+	s.parallel.locatStateObjects = nil
 	s.parallel.baseStateDB = nil
 	s.parallel.baseTxIndex = -1
 	s.parallel.dirtiedStateObjectsInSlot = addressToStateObjectsPool.Get().(map[common.Address]*stateObject)
@@ -1869,6 +1875,7 @@ func (s *ParallelStateDB) reset() {
 	s.parallel.nonceReadsInSlot = addressToUintPool.Get().(map[common.Address]uint64)
 	s.parallel.balanceChangesInSlot = addressToStructPool.Get().(map[common.Address]struct{})
 	s.parallel.balanceReadsInSlot = balancePool.Get().(map[common.Address]*big.Int)
+	s.parallel.locatStateObjects = addressToStateObjectsPool.Get().(map[common.Address]*stateObject)
 	s.parallel.codeReadsInSlot = addressToBytesPool.Get().(map[common.Address][]byte)
 	s.parallel.codeHashReadsInSlot = addressToHashPool.Get().(map[common.Address]common.Hash)
 	s.parallel.codeChangesInSlot = addressToStructPool.Get().(map[common.Address]struct{})
diff --git a/core/state/statedb.go b/core/state/statedb.go
index 92439dc361..7b959f4440 100644
--- a/core/state/statedb.go
+++ b/core/state/statedb.go
@@ -84,7 +84,7 @@ func (s *StateObjectSyncMap) StoreStateObject(addr common.Address, stateObject *
 func (s *StateDB) loadStateObj(addr common.Address) (*stateObject, bool) {
 	if s.isParallel {
 		if s.parallel.isSlotDB {
-			if ret, ok := s.parallel.stateObjects.LoadStateObject(addr); ok {
+			if ret, ok := s.parallel.locatStateObjects[addr]; ok {
 				return ret, ok
 			} else {
 				ret, ok := s.parallel.baseStateDB.loadStateObj(addr)
@@ -102,7 +102,11 @@ func (s *StateDB) loadStateObj(addr common.Address) (*stateObject, bool) {
 // storeStateObj is the entry for storing state object to stateObjects in StateDB or stateObjects in parallel
 func (s *StateDB) storeStateObj(addr common.Address, stateObject *stateObject) {
 	if s.isParallel {
-		s.parallel.stateObjects.StoreStateObject(addr, stateObject)
+		if s.parallel.isSlotDB {
+			s.parallel.locatStateObjects[addr] = stateObject
+		} else {
+			s.parallel.stateObjects.StoreStateObject(addr, stateObject)
+		}
 	} else {
 		s.stateObjects[addr] = stateObject
 	}
@@ -111,6 +115,9 @@ func (s *StateDB) storeStateObj(addr common.Address, stateObject *stateObject) {
 // deleteStateObj is the entry for deleting state object to stateObjects in StateDB or stateObjects in parallel
 func (s *StateDB) deleteStateObj(addr common.Address) {
 	if s.isParallel {
+		if s.parallel.isSlotDB {
+			delete(s.parallel.locatStateObjects, addr)
+		}
 		s.parallel.stateObjects.Delete(addr)
 	} else {
 		delete(s.stateObjects, addr)
@@ -122,7 +129,8 @@ type ParallelState struct {
 	isSlotDB  bool // denotes StateDB is used in slot, we will try to remove it
 	SlotIndex int  // for debug
 	// stateObjects holds the state objects in the base slot db
-	stateObjects *StateObjectSyncMap
+	stateObjects      *StateObjectSyncMap
+	locatStateObjects map[common.Address]*stateObject
 
 	baseStateDB               *StateDB // for parallel mode, there will be a base StateDB in dispatcher routine.
 	baseTxIndex               int      // slotDB is created base on this tx index.
@@ -968,9 +976,13 @@ func (s *StateDB) getDeletedStateObject(addr common.Address) *stateObject {
 
 func (s *StateDB) setStateObject(object *stateObject) {
 	if s.isParallel {
-		// When a state object is stored into s.parallel.stateObjects,
-		// it belongs to base StateDB, it is confirmed and valid.
-		s.parallel.stateObjects.Store(object.address, object)
+		if s.parallel.isSlotDB {
+			s.parallel.locatStateObjects[object.address] = object
+		} else {
+			// When a state object is stored into s.parallel.stateObjects,
+			// it belongs to base StateDB, it is confirmed and valid.
+			s.parallel.stateObjects.Store(object.address, object)
+		}
 	} else {
 		s.stateObjects[object.Address()] = object
 	}
@@ -1266,7 +1278,8 @@ func NewEmptySlotDB() *ParallelStateDB {
 		//
 		// We are not do simple copy (lightweight pointer copy) as the stateObject can be accessed by different thread.
 
-		stateObjects:                 &StateObjectSyncMap{}, // s.parallel.stateObjects,
+		stateObjects:                 nil, /* The parallel execution will not use this field, except the base DB */
+		locatStateObjects:            addressToStateObjectsPool.Get().(map[common.Address]*stateObject),
 		codeReadsInSlot:              addressToBytesPool.Get().(map[common.Address][]byte),
 		codeHashReadsInSlot:          addressToHashPool.Get().(map[common.Address]common.Hash),
 		codeChangesInSlot:            addressToStructPool.Get().(map[common.Address]struct{}),