diff --git a/library/think/Model.php b/library/think/Model.php
index 664caf3a..d7f5644e 100644
--- a/library/think/Model.php
+++ b/library/think/Model.php
@@ -1093,15 +1093,16 @@ abstract class Model implements \JsonSerializable, \ArrayAccess
      * @param string $foreignKey 关联外键
      * @param string $localKey 关联主键
      * @param array  $alias 别名定义
+     * @param string $joinType JOIN类型
      * @return Relation
      */
-    public function hasOne($model, $foreignKey = '', $localKey = '', $alias = [])
+    public function hasOne($model, $foreignKey = '', $localKey = '', $alias = [], $joinType = 'INNER')
     {
         // 记录当前关联信息
         $model      = $this->parseModel($model);
         $localKey   = $localKey ?: $this->getPk();
         $foreignKey = $foreignKey ?: Loader::parseName($this->name) . '_id';
-        return $this->relation()->hasOne($model, $foreignKey, $localKey, $alias);
+        return $this->relation()->hasOne($model, $foreignKey, $localKey, $alias, $joinType);
     }
 
     /**
@@ -1111,15 +1112,16 @@ abstract class Model implements \JsonSerializable, \ArrayAccess
      * @param string $foreignKey 关联外键
      * @param string $otherKey 关联主键
      * @param array  $alias 别名定义
+     * @param string $joinType JOIN类型
      * @return Relation
      */
-    public function belongsTo($model, $foreignKey = '', $otherKey = '', $alias = [])
+    public function belongsTo($model, $foreignKey = '', $otherKey = '', $alias = [], $joinType = 'INNER')
     {
         // 记录当前关联信息
         $model      = $this->parseModel($model);
         $foreignKey = $foreignKey ?: Loader::parseName(basename(str_replace('\\', '/', $model))) . '_id';
         $otherKey   = $otherKey ?: (new $model)->getPk();
-        return $this->relation()->belongsTo($model, $foreignKey, $otherKey, $alias);
+        return $this->relation()->belongsTo($model, $foreignKey, $otherKey, $alias, $joinType);
     }
 
     /**
diff --git a/library/think/db/Query.php b/library/think/db/Query.php
index b1c50e13..141cd37f 100644
--- a/library/think/db/Query.php
+++ b/library/think/db/Query.php
@@ -1391,7 +1391,7 @@ class Query
                 $joinName  = Loader::parseName(basename(str_replace('\\', '/', $info['model'])));
                 $joinAlias = isset($info['alias'][$joinName]) ? $info['alias'][$joinName] : $joinName;
                 $this->via($joinAlias);
-                $this->join($joinTable . ' ' . $joinAlias, $alias . '.' . $info['localKey'] . '=' . $joinAlias . '.' . $info['foreignKey']);
+                $this->join($joinTable . ' ' . $joinAlias, $alias . '.' . $info['localKey'] . '=' . $joinAlias . '.' . $info['foreignKey'], $info['joinType']);
                 if ($closure) {
                     // 执行闭包查询
                     call_user_func_array($closure, [ & $this]);
diff --git a/library/think/model/Relation.php b/library/think/model/Relation.php
index c32fe733..0d3f5aaf 100644
--- a/library/think/model/Relation.php
+++ b/library/think/model/Relation.php
@@ -41,6 +41,8 @@ class Relation
     protected $localKey;
     // 数据表别名
     protected $alias;
+    // 当前关联的JOIN类型
+    protected $joinType;
 
     /**
      * 架构函数
@@ -396,15 +398,17 @@ class Relation
      * @param string $foreignKey 关联外键
      * @param string $localKey 关联主键
      * @param array  $alias 别名定义
+     * @param string $joinType JOIN类型
      * @return $this
      */
-    public function hasOne($model, $foreignKey, $localKey, $alias)
+    public function hasOne($model, $foreignKey, $localKey, $alias = [], $joinType = 'INNER')
     {
         $this->type       = self::HAS_ONE;
         $this->model      = $model;
         $this->foreignKey = $foreignKey;
         $this->localKey   = $localKey;
         $this->alias      = $alias;
+        $this->joinType   = $joinType;
 
         // 返回关联的模型对象
         return $this;
@@ -417,9 +421,10 @@ class Relation
      * @param string $foreignKey 关联外键
      * @param string $otherKey 关联主键
      * @param array  $alias 别名定义
+     * @param string $joinType JOIN类型
      * @return $this
      */
-    public function belongsTo($model, $foreignKey, $otherKey, $alias)
+    public function belongsTo($model, $foreignKey, $otherKey, $alias = [], $joinType = 'INNER')
     {
         // 记录当前关联信息
         $this->type       = self::BELONGS_TO;
@@ -427,6 +432,7 @@ class Relation
         $this->foreignKey = $foreignKey;
         $this->localKey   = $otherKey;
         $this->alias      = $alias;
+        $this->joinType   = $joinType;
 
         // 返回关联的模型对象
         return $this;