diff --git a/app/Models/Dealer.php b/app/Models/Dealer.php
index 494b9513..3b549789 100644
--- a/app/Models/Dealer.php
+++ b/app/Models/Dealer.php
@@ -61,8 +61,102 @@ class Dealer extends Model
         return $this->hasMany(DealerManageSubsidyLog::class, 'user_id', 'user_id');
     }
 
+    /**
+     * 属于此经销商的升级日志
+     */
+    public function lvlUpgradeLogs()
+    {
+        return $this->hasMany(DealerLvlUpgradeLog::class, 'user_id', 'user_id');
+    }
+
     public function getLvlTextAttribute()
     {
         return $this->lvl->text();
     }
+
+    /**
+     * 确认此经销商是否是金牌经销商
+     *
+     * @return boolean
+     */
+    public function isGoldDealer()
+    {
+        return $this->lvl === DealerLvl::Gold;
+    }
+
+    /**
+     * 确认此经销商是否是特邀经销商
+     *
+     * @return boolean
+     */
+    public function isSpecialDealer()
+    {
+        return $this->lvl === DealerLvl::Special;
+    }
+
+    /**
+     * 获取此用户的所有上级经销商
+     *
+     * @return array
+     */
+    public function getDealers()
+    {
+        if (empty($pids = $this->userInfo->parent_ids)) {
+            return [];
+        }
+
+        $ancestors = UserInfo::with(['dealer'])
+                            ->whereIn('user_id', $pids)
+                            ->latest('depth')
+                            ->get(['user_id']);
+
+        return $ancestors->map(function ($item) {
+            return $item->dealer;
+        })->all();
+    }
+
+    /**
+     * 获取此用户的所有直属上级经销商
+     *
+     * @return array
+     */
+    public function getRealDealers()
+    {
+        if (empty($pids = $this->userInfo->real_parent_ids)) {
+            return [];
+        }
+
+        $ancestors = UserInfo::with(['dealer'])
+                            ->whereIn('user_id', $pids)
+                            ->latest('depth')
+                            ->get(['user_id']);
+
+        return $ancestors->map(function ($item) {
+            return $item->dealer;
+        })->all();
+    }
+
+    /**
+     * 变更经销商等级
+     *
+     * @param DealerLvl $lvl
+     * @param string $remark
+     * @return void
+     */
+    public function changeLvl(DealerLvl $lvl, string $remark = null)
+    {
+        $beforeLvl = $this->lvl;
+
+        $this->update([
+            'lvl' => $lvl,
+        ]);
+
+        if ($this->wasChanged('lvl')) {
+            $this->lvlUpgradeLogs()->create([
+                'change_lvl' => $this->lvl,
+                'before_lvl' => $beforeLvl,
+                'remark' => $remark,
+            ]);
+        }
+    }
 }
diff --git a/app/Models/DealerLvlUpgradeLog.php b/app/Models/DealerLvlUpgradeLog.php
new file mode 100644
index 00000000..38caffa9
--- /dev/null
+++ b/app/Models/DealerLvlUpgradeLog.php
@@ -0,0 +1,21 @@
+<?php
+
+namespace App\Models;
+
+use App\Enums\DealerLvl;
+use Illuminate\Database\Eloquent\Model;
+
+class DealerLvlUpgradeLog extends Model
+{
+    protected $casts = [
+        'change_lvl' => DealerLvl::class,
+        'before_lvl' => DealerLvl::class,
+    ];
+
+    protected $fillable = [
+        'user_id',
+        'change_lvl',
+        'before_lvl',
+        'remark',
+    ];
+}
diff --git a/database/migrations/2022_02_20_150611_create_dealer_lvl_upgrade_logs_table.php b/database/migrations/2022_02_20_150611_create_dealer_lvl_upgrade_logs_table.php
new file mode 100644
index 00000000..d3770f0b
--- /dev/null
+++ b/database/migrations/2022_02_20_150611_create_dealer_lvl_upgrade_logs_table.php
@@ -0,0 +1,35 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class CreateDealerLvlUpgradeLogsTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::create('dealer_lvl_upgrade_logs', function (Blueprint $table) {
+            $table->id();
+            $table->unsignedBigInteger('user_id');
+            $table->tinyInteger('change_lvl')->comment('变更后的等级');
+            $table->tinyInteger('before_lvl')->comment('变更前的等级');
+            $table->string('remark')->nullable()->comment('备注');
+            $table->timestamps();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::dropIfExists('dealer_lvl_upgrade_logs');
+    }
+}