diff --git a/kernel/contract/util.go b/kernel/contract/util.go
index 3e28bbf2..8dafff9b 100644
--- a/kernel/contract/util.go
+++ b/kernel/contract/util.go
@@ -10,7 +10,7 @@ var (
 )
 
 const (
-	contractNameMaxSize = 16
+	contractNameMaxSize = 64
 	contractNameMinSize = 4
 )
 
diff --git a/kernel/permission/acl/utils/def.go b/kernel/permission/acl/utils/def.go
index 25b3d713..b737c937 100644
--- a/kernel/permission/acl/utils/def.go
+++ b/kernel/permission/acl/utils/def.go
@@ -7,7 +7,7 @@ const (
 
 const (
 	accountSize            = 16
-	contractNameMaxSize    = 16
+	contractNameMaxSize    = 64
 	contractNameMinSize    = 4
 	accountPrefix          = "XC"
 	accountBucket          = "XCAccount"