diff --git a/library/think/model/relation/BelongsTo.php b/library/think/model/relation/BelongsTo.php
index 905ea944..a32cc124 100644
--- a/library/think/model/relation/BelongsTo.php
+++ b/library/think/model/relation/BelongsTo.php
@@ -143,10 +143,11 @@ class BelongsTo extends OneToOne
                     $relationModel->isUpdate(true);
                 }
 
-                if ($relationModel && !empty($this->bindAttr)) {
+                if (!empty($this->bindAttr)) {
                     // 绑定关联属性
                     $this->bindAttr($relationModel, $result, $this->bindAttr);
                 }
+
                 // 设置关联属性
                 $result->setRelation($attr, $relationModel);
             }
@@ -175,7 +176,7 @@ class BelongsTo extends OneToOne
             $relationModel->setParent(clone $result);
             $relationModel->isUpdate(true);
         }
-        if ($relationModel && !empty($this->bindAttr)) {
+        if (!empty($this->bindAttr)) {
             // 绑定关联属性
             $this->bindAttr($relationModel, $result, $this->bindAttr);
         }
diff --git a/library/think/model/relation/HasOne.php b/library/think/model/relation/HasOne.php
index c500c02a..99327da2 100644
--- a/library/think/model/relation/HasOne.php
+++ b/library/think/model/relation/HasOne.php
@@ -140,10 +140,10 @@ class HasOne extends OneToOne
                     $relationModel = $data[$result->$localKey];
                     $relationModel->setParent(clone $result);
                     $relationModel->isUpdate(true);
-                    if (!empty($this->bindAttr)) {
-                        // 绑定关联属性
-                        $this->bindAttr($relationModel, $result, $this->bindAttr);
-                    }
+                }
+                if (!empty($this->bindAttr)) {
+                    // 绑定关联属性
+                    $this->bindAttr($relationModel, $result, $this->bindAttr);
                 }
                 // 设置关联属性
                 $result->setRelation($attr, $relationModel);
@@ -173,10 +173,10 @@ class HasOne extends OneToOne
             $relationModel = $data[$result->$localKey];
             $relationModel->setParent(clone $result);
             $relationModel->isUpdate(true);
-            if (!empty($this->bindAttr)) {
-                // 绑定关联属性
-                $this->bindAttr($relationModel, $result, $this->bindAttr);
-            }
+        }
+        if (!empty($this->bindAttr)) {
+            // 绑定关联属性
+            $this->bindAttr($relationModel, $result, $this->bindAttr);
         }
 
         $result->setRelation(Loader::parseName($relation), $relationModel);
diff --git a/library/think/model/relation/OneToOne.php b/library/think/model/relation/OneToOne.php
index ff066ed3..7877eaaa 100644
--- a/library/think/model/relation/OneToOne.php
+++ b/library/think/model/relation/OneToOne.php
@@ -276,7 +276,7 @@ abstract class OneToOne extends Relation
             if (isset($result->$key)) {
                 throw new Exception('bind attr has exists:' . $key);
             } else {
-                $result->setAttr($key, $model->$attr);
+                $result->setAttr($key, $model ? $model->$attr : null);
             }
         }
     }