diff --git a/library/think/Model.php b/library/think/Model.php
index f5c5b0fb..80eb92ea 100644
--- a/library/think/Model.php
+++ b/library/think/Model.php
@@ -837,15 +837,16 @@ abstract class Model implements \JsonSerializable, \ArrayAccess
      * @param string $model 模型名
      * @param string $foreignKey 关联外键
      * @param string $localKey 关联主键
+     * @param array  $alias 别名定义
      * @return \think\db\Query|string
      */
-    public function hasOne($model, $foreignKey = '', $localKey = '')
+    public function hasOne($model, $foreignKey = '', $localKey = '', $alias = [])
     {
         // 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);
+        return $this->relation()->hasOne($model, $foreignKey, $localKey, $alias);
     }
 
     /**
@@ -854,15 +855,16 @@ abstract class Model implements \JsonSerializable, \ArrayAccess
      * @param string $model 模型名
      * @param string $foreignKey 关联外键
      * @param string $otherKey 关联主键
+     * @param array  $alias 别名定义
      * @return \think\db\Query|string
      */
-    public function belongsTo($model, $foreignKey = '', $otherKey = '')
+    public function belongsTo($model, $foreignKey = '', $otherKey = '', $alias = [])
     {
         // 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);
+        return $this->relation()->belongsTo($model, $foreignKey, $otherKey, $alias);
     }
 
     /**
@@ -871,15 +873,16 @@ abstract class Model implements \JsonSerializable, \ArrayAccess
      * @param string $model 模型名
      * @param string $foreignKey 关联外键
      * @param string $localKey 关联主键
+     * @param array  $alias 别名定义
      * @return \think\db\Query|string
      */
-    public function hasMany($model, $foreignKey = '', $localKey = '')
+    public function hasMany($model, $foreignKey = '', $localKey = '', $alias = [])
     {
         // 记录当前关联信息
         $model      = $this->parseModel($model);
         $localKey   = $localKey ?: $this->getPk();
         $foreignKey = $foreignKey ?: Loader::parseName($this->name) . '_id';
-        return $this->relation()->hasMany($model, $foreignKey, $localKey);
+        return $this->relation()->hasMany($model, $foreignKey, $localKey, $alias);
     }
 
     /**
@@ -889,9 +892,10 @@ abstract class Model implements \JsonSerializable, \ArrayAccess
      * @param string $table 中间表名
      * @param string $foreignKey 关联外键
      * @param string $localKey 当前模型关联键
+     * @param array  $alias 别名定义
      * @return \think\db\Query|string
      */
-    public function belongsToMany($model, $table = '', $foreignKey = '', $localKey = '')
+    public function belongsToMany($model, $table = '', $foreignKey = '', $localKey = '', $alias = [])
     {
         // 记录当前关联信息
         $model      = $this->parseModel($model);
@@ -899,7 +903,7 @@ abstract class Model implements \JsonSerializable, \ArrayAccess
         $table      = $table ?: Db::name(Loader::parseName($this->name) . '_' . $name)->getTable();
         $foreignKey = $foreignKey ?: $name . '_id';
         $localKey   = $localKey ?: Loader::parseName($this->name) . '_id';
-        return $this->relation()->belongsToMany($model, $table, $foreignKey, $localKey);
+        return $this->relation()->belongsToMany($model, $table, $foreignKey, $localKey, $alias);
     }
 
     /**
diff --git a/library/think/db/Query.php b/library/think/db/Query.php
index 1674f42c..bd1138ca 100644
--- a/library/think/db/Query.php
+++ b/library/think/db/Query.php
@@ -1294,13 +1294,15 @@ class Query
                 if (0 == $i) {
                     $name  = Loader::parseName(basename(str_replace('\\', '/', $currentModel)));
                     $table = $this->getTable();
-                    $this->table($table)->alias($name)->field(true, false, $table, $name);
+                    $alias = isset($info['alias'][$name]) ? $info['alias'][$name] : $name;
+                    $this->table($table)->alias($alias)->field(true, false, $table, $alias);
                 }
                 // 预载入封装
                 $joinTable = $model->getTable();
                 $joinName  = Loader::parseName(basename(str_replace('\\', '/', $info['model'])));
-                $this->via($joinName);
-                $this->join($joinTable . ' ' . $joinName, $name . '.' . $info['localKey'] . '=' . $joinName . '.' . $info['foreignKey'])->field(true, false, $joinTable, $joinName, $joinName . '__');
+                $joinAlias = isset($info['alias'][$joinName]) ? $info['alias'][$joinName] : $joinName;
+                $this->via($joinAlias);
+                $this->join($joinTable . ' ' . $joinAlias, $alias . '.' . $info['localKey'] . '=' . $joinAlias . '.' . $info['foreignKey'])->field(true, false, $joinTable, $joinAlias, $joinName . '__');
                 if ($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 2c058096..c5965743 100644
--- a/library/think/model/Relation.php
+++ b/library/think/model/Relation.php
@@ -36,6 +36,8 @@ class Relation
     protected $foreignKey;
     // 关联键
     protected $localKey;
+    // 数据表别名
+    protected $alias;
 
     /**
      * 架构函数
@@ -61,6 +63,7 @@ class Relation
             'middle'     => $this->middle,
             'foreignKey' => $this->foreignKey,
             'localKey'   => $this->localKey,
+            'alias'      => $this->alias,
         ];
         return $name ? $info[$name] : $info;
     }
@@ -371,20 +374,34 @@ class Relation
         return $data;
     }
 
+    /**
+     * 设置当前关联定义的数据表别名
+     * @access public
+     * @param array  $alias 别名定义
+     * @return $this
+     */
+    public function setAlias($alias)
+    {
+        $this->alias = $alias;
+        return $this;
+    }
+
     /**
      * HAS ONE 关联定义
      * @access public
      * @param string $model 模型名
      * @param string $foreignKey 关联外键
      * @param string $localKey 关联主键
+     * @param array  $alias 别名定义
      * @return $this
      */
-    public function hasOne($model, $foreignKey, $localKey)
+    public function hasOne($model, $foreignKey, $localKey, $alias)
     {
         $this->type       = self::HAS_ONE;
         $this->model      = $model;
         $this->foreignKey = $foreignKey;
         $this->localKey   = $localKey;
+        $this->alias      = $alias;
 
         // 返回关联的模型对象
         return $this;
@@ -396,15 +413,17 @@ class Relation
      * @param string $model 模型名
      * @param string $foreignKey 关联外键
      * @param string $otherKey 关联主键
+     * @param array  $alias 别名定义
      * @return $this
      */
-    public function belongsTo($model, $foreignKey, $otherKey)
+    public function belongsTo($model, $foreignKey, $otherKey, $alias)
     {
         // 记录当前关联信息
         $this->type       = self::BELONGS_TO;
         $this->model      = $model;
         $this->foreignKey = $foreignKey;
         $this->localKey   = $otherKey;
+        $this->alias      = $alias;
 
         // 返回关联的模型对象
         return $this;
@@ -416,15 +435,17 @@ class Relation
      * @param string $model 模型名
      * @param string $foreignKey 关联外键
      * @param string $localKey 关联主键
+     * @param array  $alias 别名定义
      * @return $this
      */
-    public function hasMany($model, $foreignKey, $localKey)
+    public function hasMany($model, $foreignKey, $localKey, $alias)
     {
         // 记录当前关联信息
         $this->type       = self::HAS_MANY;
         $this->model      = $model;
         $this->foreignKey = $foreignKey;
         $this->localKey   = $localKey;
+        $this->alias      = $alias;
 
         // 返回关联的模型对象
         return $this;
@@ -437,9 +458,10 @@ class Relation
      * @param string $table 中间表名
      * @param string $foreignKey 关联模型外键
      * @param string $localKey 当前模型关联键
+     * @param array  $alias 别名定义
      * @return $this
      */
-    public function belongsToMany($model, $table, $foreignKey, $localKey)
+    public function belongsToMany($model, $table, $foreignKey, $localKey, $alias)
     {
         // 记录当前关联信息
         $this->type       = self::BELONGS_TO_MANY;
@@ -447,6 +469,7 @@ class Relation
         $this->foreignKey = $foreignKey;
         $this->localKey   = $localKey;
         $this->middle     = $table;
+        $this->alias      = $alias;
 
         // 返回关联的模型对象
         return $this;