diff --git a/library/think/Model.php b/library/think/Model.php
index 7707384a..c93a86e0 100644
--- a/library/think/Model.php
+++ b/library/think/Model.php
@@ -862,9 +862,10 @@ abstract class Model implements \JsonSerializable, \ArrayAccess
     {
         // 记录当前关联信息
         $model      = $this->parseModel($model);
-        $table      = $table ?: Db::name(strtolower($this->name . '_' . basename(str_replace('\\', '/', $model))))->getTableName();
-        $localKey   = $localKey ?: Loader::parseName(basename(str_replace('\\', '/', $model))) . '_id';
-        $foreignKey = $foreignKey ?: strtolower($this->name) . '_id';
+        $name       = Loader::parseName(basename(str_replace('\\', '/', $model)));
+        $table      = $table ?: Db::name(Loader::parseName($this->name) . '_' . $name)->getTableName();
+        $localKey   = $localKey ?: $name . '_id';
+        $foreignKey = $foreignKey ?: Loader::parseName($this->name) . '_id';
 
         return $this->relation->belongsToMany($model, $table, $localKey, $foreignKey);
     }
diff --git a/library/think/db/Query.php b/library/think/db/Query.php
index 7195e6c4..d042b8a2 100644
--- a/library/think/db/Query.php
+++ b/library/think/db/Query.php
@@ -845,13 +845,13 @@ class Query
             $info  = $class->getRelationInfo();
             if (in_array($info['type'], [Relation::HAS_ONE, Relation::BELONGS_TO])) {
                 if (0 == $i) {
-                    $joinName  = strtolower(basename(str_replace('\\', '/', $this->options['model'])));
+                    $joinName  = Loader::parseName(basename(str_replace('\\', '/', $this->options['model'])));
                     $joinTable = $this->connection->getTableName();
                     $this->table($joinTable)->alias($joinName)->field(true, false, $joinTable, $joinName);
                 }
                 // 预载入封装
                 $table = $info['model']::getTableName();
-                $name  = strtolower(basename(str_replace('\\', '/', $info['model'])));
+                $name  = Loader::parseName(basename(str_replace('\\', '/', $info['model'])));
                 $this->via($name);
                 $this->join($table . ' ' . $name, $joinName . '.' . $info['localKey'] . '=' . $name . '.' . $info['foreignKey'])->field(true, false, $table, $name, $name . '__');
                 if ($closure) {
diff --git a/library/think/model/Relation.php b/library/think/model/Relation.php
index 674510cb..38351ccf 100644
--- a/library/think/model/Relation.php
+++ b/library/think/model/Relation.php
@@ -13,6 +13,7 @@ namespace think\model;
 
 use think\Db;
 use think\Exception;
+use think\Loader;
 use think\model\Pivot;
 
 class Relation
@@ -257,7 +258,7 @@ class Relation
      */
     protected function match($model, $relation, &$result)
     {
-        $modelName = strtolower(basename(str_replace('\\', '/', $model)));
+        $modelName = Loader::parseName(basename(str_replace('\\', '/', $model)));
         // 重新组装模型数据
         foreach ($result->toArray() as $key => $val) {
             if (strpos($key, '__')) {