diff --git a/application/api/model/Topic.php b/application/api/model/Topic.php
index cce1b47..a29677b 100644
--- a/application/api/model/Topic.php
+++ b/application/api/model/Topic.php
@@ -44,7 +44,7 @@ class Topic extends Model
         if($list){
             foreach ($list as &$item){
                 $item['content'] = $this->where(['id'=>$item['topic_id']])->value('content');
-                $item['pic'] = $this->where(['id'=>$item['topic_id']])->value('pic');
+                $item['pic'] = $this->where(['id'=>$item['topic_id']])->value('pic') ?? get_system_config_value('web_site').'/data/avatar/head_pic.png';;
                 $item['title'] = $this->where(['id'=>$item['topic_id']])->value('title');
             }
         }
diff --git a/application/api/model/UserWallet.php b/application/api/model/UserWallet.php
index b6dfd95..10d4e92 100644
--- a/application/api/model/UserWallet.php
+++ b/application/api/model/UserWallet.php
@@ -106,10 +106,11 @@ class UserWallet extends Model
             return ['code' => 0, 'msg' => '钻石数量不足', 'data' => null];
         }
 
+        $ear_exchange_coin = get_system_config_value('coin_exchange_rate');
         $data = [
             'user_id' => $uid,
             'earnings_num' => $earnings_num,
-            'coin_num' => $earnings_num * 10,
+            'coin_num' => $earnings_num * $ear_exchange_coin,
             'createtime' => time(),
         ];
         //开启事务
@@ -130,7 +131,7 @@ class UserWallet extends Model
         $account_log[] = [
             'user_id'     => $uid,
             'money_type'  => 1,
-            'change_value'  => $earnings_num * 10,
+            'change_value'  => $earnings_num * $ear_exchange_coin,
             'remarks' => '收益兑换',
             'change_type' => 14,
             'createtime' => time(),
@@ -138,7 +139,7 @@ class UserWallet extends Model
         ];
         $re = db::name('vs_user_money_log')->insertAll($account_log);
         $re1 = db::name('user_wallet')->where('user_id',$uid)->setDec('earnings',$earnings_num);
-        $re2 = db::name('user_wallet')->where('user_id',$uid)->setInc('coin',$earnings_num * 10);
+        $re2 = db::name('user_wallet')->where('user_id',$uid)->setInc('coin',$earnings_num * $ear_exchange_coin);
         if($re && $re1 && $re2){
             db::commit();
             return ['code' => 1, 'msg' => '兑换成功', 'data' => null];