diff --git a/src/main/entry/org/bdware/sc/bean/ContractExecType.java b/src/main/entry/org/bdware/sc/bean/ContractExecType.java
index 3ff7568..5d198cd 100644
--- a/src/main/entry/org/bdware/sc/bean/ContractExecType.java
+++ b/src/main/entry/org/bdware/sc/bean/ContractExecType.java
@@ -10,7 +10,9 @@ public enum ContractExecType implements Serializable {
     RequestAllResponseHalf,
     RequestAllResponseAll,
     Sharding,//分片执行模式
-    SelfAdaptiveSharding; // self-adaptive sharding
+    SelfAdaptiveSharding,// self-adaptive sharding
+    PBFT; //PBFT
+
 
     public static ContractExecType getContractTypeByInt(int i) {
         ContractExecType[] values = ContractExecType.values();
@@ -20,6 +22,10 @@ public enum ContractExecType implements Serializable {
         return ContractExecType.values()[i];
     }
 
+    public boolean isUnit() {
+        return this != Sole;
+    }
+
     public boolean needSeq() {
         switch (this) {
             case Sole: