diff --git a/core/state/statedb.go b/core/state/statedb.go
index ee7ae7020a..f3d0478482 100644
--- a/core/state/statedb.go
+++ b/core/state/statedb.go
@@ -1553,81 +1553,6 @@ func (s *StateDB) Commit(failPostCommitFunc func(), postCommitFuncs ...func() er
 	return root, diffLayer, nil
 }
 
-// GenerateDiffLayer generates block's DiffLayer after executing the block's txs.
-// Attention, the DiffLayer returned include no Receipts, whose accounts' storage root
-// is empty, whose BlockHash and Number field is empty, should further process by caller.
-func (s *StateDB) GenerateDiffLayer() *types.DiffLayer {
-	if s.snap == nil {
-		return nil
-	}
-
-	for addr := range s.stateObjectsPending {
-		if obj := s.stateObjects[addr]; !obj.deleted {
-			// The snapshot storage map for the object
-			var storage map[string][]byte
-			obj.finalise(false)
-			for key, value := range obj.pendingStorage {
-				// Skip noop changes, persist actual changes
-				if value == obj.originStorage[key] {
-					continue
-				}
-				obj.originStorage[key] = value
-
-				var v []byte
-				if (value != common.Hash{}) {
-					// Encoding []byte cannot fail, ok to ignore the error.
-					v, _ = rlp.EncodeToBytes(common.TrimLeftZeroes(value[:]))
-				}
-
-				obj.db.snapMux.Lock()
-				if storage == nil {
-					// Retrieve the old storage map, if available, create a new one otherwise
-					if storage = obj.db.snapStorage[obj.address]; storage == nil {
-						storage = make(map[string][]byte)
-						obj.db.snapStorage[obj.address] = storage
-					}
-				}
-				storage[string(key[:])] = v // v will be nil if value is 0x00
-				obj.db.snapMux.Unlock()
-			}
-
-			if !obj.deleted {
-				s.snapMux.Lock()
-				// The storage root hasn't been intermediate, pass empty storage root here.
-				s.snapAccounts[obj.address] = snapshot.SlimAccountRLP(obj.data.Nonce, obj.data.Balance, common.Hash{}, obj.data.CodeHash)
-				s.snapMux.Unlock()
-			}
-		}
-	}
-
-	var diffLayer = &types.DiffLayer{}
-	for addr := range s.stateObjectsDirty {
-		if obj := s.stateObjects[addr]; !obj.deleted {
-			if obj.code != nil && obj.dirtyCode {
-				diffLayer.Codes = append(diffLayer.Codes, types.DiffCode{
-					Hash: common.BytesToHash(obj.CodeHash()),
-					Code: obj.code,
-				})
-			}
-		}
-	}
-
-	diffLayer.Destructs, diffLayer.Accounts, diffLayer.Storages = s.SnapToDiffLayer()
-	sort.SliceStable(diffLayer.Codes, func(i, j int) bool {
-		return diffLayer.Codes[i].Hash.Hex() < diffLayer.Codes[j].Hash.Hex()
-	})
-	sort.SliceStable(diffLayer.Destructs, func(i, j int) bool {
-		return diffLayer.Destructs[i].Hex() < (diffLayer.Destructs[j].Hex())
-	})
-	sort.SliceStable(diffLayer.Accounts, func(i, j int) bool {
-		return diffLayer.Accounts[i].Account.Hex() < diffLayer.Accounts[j].Account.Hex()
-	})
-	sort.SliceStable(diffLayer.Storages, func(i, j int) bool {
-		return diffLayer.Storages[i].Account.Hex() < diffLayer.Storages[j].Account.Hex()
-	})
-	return diffLayer
-}
-
 func (s *StateDB) DiffLayerToSnap(diffLayer *types.DiffLayer) (map[common.Address]struct{}, map[common.Address][]byte, map[common.Address]map[string][]byte, error) {
 	snapDestructs := make(map[common.Address]struct{})
 	snapAccounts := make(map[common.Address][]byte)