diff --git a/library/think/Model.php b/library/think/Model.php
index fb2f5abf..d8e76ce6 100644
--- a/library/think/Model.php
+++ b/library/think/Model.php
@@ -726,7 +726,7 @@ abstract class Model implements \JsonSerializable, \ArrayAccess
         $this->autoCompleteData($this->auto);
 
         // 自动写入更新时间
-        if ($this->autoWriteTimestamp && $this->updateTime) {
+        if ($this->autoWriteTimestamp && $this->updateTime && !isset($this->data[$this->updateTime])) {
             $this->setAttr($this->updateTime, null);
         }
 
@@ -783,7 +783,7 @@ abstract class Model implements \JsonSerializable, \ArrayAccess
             $this->autoCompleteData($this->insert);
 
             // 自动写入创建时间
-            if ($this->autoWriteTimestamp && $this->createTime) {
+            if ($this->autoWriteTimestamp && $this->createTime && !isset($this->data[$this->createTime])) {
                 $this->setAttr($this->createTime, null);
             }
 
diff --git a/library/think/model/Merge.php b/library/think/model/Merge.php
index 3cf5c3f6..5edb2a45 100644
--- a/library/think/model/Merge.php
+++ b/library/think/model/Merge.php
@@ -169,7 +169,7 @@ class Merge extends Model
         $this->autoCompleteData($this->auto);
 
         // 自动写入更新时间
-        if ($this->autoWriteTimestamp && $this->updateTime) {
+        if ($this->autoWriteTimestamp && $this->updateTime && !isset($this->data[$this->updateTime])) {
             $this->setAttr($this->updateTime, null);
         }
 
@@ -221,7 +221,7 @@ class Merge extends Model
                 $this->autoCompleteData($this->insert);
 
                 // 自动写入创建时间
-                if ($this->autoWriteTimestamp && $this->createTime) {
+                if ($this->autoWriteTimestamp && $this->createTime && !isset($this->data[$this->createTime])) {
                     $this->setAttr($this->createTime, null);
                 }