diff --git a/interface/store/arbiters.go b/interface/store/arbiters.go
index de6bfe8..41fe0ed 100644
--- a/interface/store/arbiters.go
+++ b/interface/store/arbiters.go
@@ -180,11 +180,22 @@ func (c *arbiters) Clear() error {
 	c.Lock()
 	defer c.Unlock()
 	it := c.db.NewIterator(dbutil.BytesPrefix(BKTArbiters), nil)
-	defer it.Release()
 	for it.Next() {
 		c.b.Delete(it.Key())
 	}
+	it.Release()
 	c.b.Delete(BKTArbPosition)
+	c.b.Delete(BKTArbPositions)
+	it = c.db.NewIterator(dbutil.BytesPrefix(BKTArbitersData), nil)
+	for it.Next() {
+		c.b.Delete(it.Key())
+	}
+	it.Release()
+	it = c.db.NewIterator(dbutil.BytesPrefix(BKTTransactionHeight), nil)
+	for it.Next() {
+		c.b.Delete(it.Key())
+	}
+	it.Release()
 	return c.db.Write(c.b, nil)
 }
 
diff --git a/interface/store/customid.go b/interface/store/customid.go
index 1edd824..2ff8e37 100644
--- a/interface/store/customid.go
+++ b/interface/store/customid.go
@@ -556,22 +556,29 @@ func (c *customID) Clear() error {
 
 	batch := new(leveldb.Batch)
 	it := c.db.NewIterator(util.BytesPrefix(BKTReservedCustomID), nil)
-	defer it.Release()
 	for it.Next() {
 		batch.Delete(it.Key())
 	}
+	it.Release()
 
 	it = c.db.NewIterator(util.BytesPrefix(BKTReceivedCustomID), nil)
-	defer it.Release()
 	for it.Next() {
 		batch.Delete(it.Key())
 	}
+	it.Release()
 
 	it = c.db.NewIterator(util.BytesPrefix(BKTChangeCustomIDFee), nil)
-	defer it.Release()
 	for it.Next() {
 		batch.Delete(it.Key())
 	}
+	it.Release()
+
+	it = c.db.NewIterator(util.BytesPrefix(BKTLastCustomIDFee), nil)
+	for it.Next() {
+		batch.Delete(it.Key())
+	}
+	it.Release()
+
 	return c.db.Write(c.b, nil)
 }
 
diff --git a/interface/store/upgrade.go b/interface/store/upgrade.go
index 156e8ca..9052e84 100644
--- a/interface/store/upgrade.go
+++ b/interface/store/upgrade.go
@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"errors"
 	"github.com/elastos/Elastos.ELA/core/types/payload"
+	dbutil "github.com/syndtr/goleveldb/leveldb/util"
 	"sync"
 
 	"github.com/elastos/Elastos.ELA/common"
@@ -11,7 +12,7 @@ import (
 	"github.com/syndtr/goleveldb/leveldb"
 )
 
-// Ensure arbiters implement arbiters interface.
+// Ensure upgrade implement Upgrade interface.
 var _ Upgrade = (*upgrade)(nil)
 
 type upgrade struct {
@@ -23,7 +24,22 @@ type upgrade struct {
 }
 
 func (u *upgrade) Clear() error {
-	panic("implement me")
+	u.Lock()
+	defer u.Unlock()
+	it := u.db.NewIterator(dbutil.BytesPrefix(BKTUpgradeControversial), nil)
+	for it.Next() {
+		u.b.Delete(it.Key())
+	}
+	it.Release()
+	it = u.db.NewIterator(dbutil.BytesPrefix(BKTUpgradeCode), nil)
+	for it.Next() {
+		u.b.Delete(it.Key())
+	}
+	it.Release()
+
+	u.b.Delete(BKTUpgradePositions)
+
+	return u.db.Write(u.b, nil)
 }
 
 func (u *upgrade) Close() error {
@@ -80,7 +96,7 @@ func (u *upgrade) batchPutUpgradeResult(proposalHash common.Uint256, batch *leve
 	}
 	newPosCache = append(newPosCache, info.WorkingHeight)
 	u.posCache = newPosCache
-	batch.Put(BKTArbPositions, uint32ArrayToBytes(u.posCache))
+	batch.Put(BKTUpgradePositions, uint32ArrayToBytes(u.posCache))
 
 	index := getIndex(info.WorkingHeight)
 	batch.Put(toKey(BKTUpgradeCode, index...), data)