diff --git a/ess/ess-api/src/main/java/cn/axzo/nanopart/ess/api/response/CreateContractByFileResponse.java b/ess/ess-api/src/main/java/cn/axzo/nanopart/ess/api/response/CreateContractByFileResponse.java
index 1dec8603..6352f25a 100644
--- a/ess/ess-api/src/main/java/cn/axzo/nanopart/ess/api/response/CreateContractByFileResponse.java
+++ b/ess/ess-api/src/main/java/cn/axzo/nanopart/ess/api/response/CreateContractByFileResponse.java
@@ -26,6 +26,11 @@ public class CreateContractByFileResponse {
      */
     private List<String> essRecipientIds;
 
+    /**
+     * 是否重复 (幂等)
+     */
+    private boolean isDuplicate;
+
     @Override
     public String toString() {
         return JSON.toJSONString(this);
diff --git a/ess/ess-server/src/main/java/cn/axzo/nanopart/ess/server/ess/ContractManager.java b/ess/ess-server/src/main/java/cn/axzo/nanopart/ess/server/ess/ContractManager.java
index bd5f1077..05fde93d 100644
--- a/ess/ess-server/src/main/java/cn/axzo/nanopart/ess/server/ess/ContractManager.java
+++ b/ess/ess-server/src/main/java/cn/axzo/nanopart/ess/server/ess/ContractManager.java
@@ -48,12 +48,14 @@ public class ContractManager {
 
     public CreateContractByFileResponse
     createContractByFile(CreateContractByFileRequest request) {
-        essLogDao.logRequest("createContractByFile", request.getIdempotentCode(), request);
+        essLogDao.logRequest("createContractByFile", request.getBizCode(), request);
         contractSupport.validateCreateContract(request.getContract());
         EssContract contract;
         try {
             contract = contractSupport.saveContractByFile(request);
         } catch (DuplicateKeyException e) {
+            essLogDao.log("createContractByFile", request.getBizCode(),
+                    "message", "重复创建合同", "request", request);
             return contractSupport.createDuplicateContractByFileResponse(request);
         }
         try {
diff --git a/ess/ess-server/src/main/java/cn/axzo/nanopart/ess/server/ess/support/ContractSupport.java b/ess/ess-server/src/main/java/cn/axzo/nanopart/ess/server/ess/support/ContractSupport.java
index 9a94cc63..c7d71156 100644
--- a/ess/ess-server/src/main/java/cn/axzo/nanopart/ess/server/ess/support/ContractSupport.java
+++ b/ess/ess-server/src/main/java/cn/axzo/nanopart/ess/server/ess/support/ContractSupport.java
@@ -97,6 +97,7 @@ public class ContractSupport {
         response.setEssRecipientIds(savedContract.getApprovers().stream()
                 .map(Approver::getEssRecipientId)
                 .collect(toList()));
+        response.setDuplicate(true);
         return response;
     }