diff --git a/server/app/dice/logic/reward_config_record/WeightTestRunner.php b/server/app/dice/logic/reward_config_record/WeightTestRunner.php
index 9bbc2dd..df21c24 100644
--- a/server/app/dice/logic/reward_config_record/WeightTestRunner.php
+++ b/server/app/dice/logic/reward_config_record/WeightTestRunner.php
@@ -62,11 +62,6 @@ class WeightTestRunner
             return;
         }
 
-        $anteRandom = $this->isAnteRandomMode($record);
-        $ante = is_numeric($record->ante ?? null) ? intval($record->ante) : 1;
-        if (!$anteRandom && $ante <= 0) {
-            $ante = 1;
-        }
         $paidS = (int) ($record->paid_s_count ?? 0);
         $paidN = (int) ($record->paid_n_count ?? 0);
         $total = $paidS + $paidN;
@@ -77,6 +72,12 @@ class WeightTestRunner
 
         $this->runDeptId = $this->resolveRunDeptId($recordId, $record);
         $deptId = $this->runDeptId;
+
+        $anteRandom = $this->isAnteRandomMode($record);
+        $ante = is_numeric($record->ante ?? null) ? intval($record->ante) : 1;
+        if (!$anteRandom && $ante <= 0) {
+            $ante = $this->getMinAnteMult($deptId);
+        }
         DiceReward::setRequestDeptId($deptId);
         DiceRewardConfig::clearRequestInstance();
 
@@ -210,19 +211,22 @@ class WeightTestRunner
             $queue[] = ['paid', 1, $anteRandom ? 0 : $ante];
         }
         $qi = 0;
+        $lastPaidPlayAnte = 0;
         while ($qi < count($queue)) {
             $item = $queue[$qi];
             $isPaid = $item[0] === 'paid';
             $dir = $item[1];
             $playAnte = (int) $item[2];
+            $playAnte = $this->resolvePlayAnteMult(
+                $deptId,
+                $playAnte,
+                $isPaid,
+                $anteRandom,
+                $ante,
+                $lastPaidPlayAnte
+            );
             if ($isPaid) {
-                if ($anteRandom) {
-                    $playAnte = $this->pickRandomAnteMult($deptId);
-                } elseif ($playAnte <= 0) {
-                    $playAnte = $ante > 0 ? $ante : 1;
-                }
-            } elseif ($playAnte <= 0) {
-                $playAnte = $ante > 0 ? $ante : 1;
+                $lastPaidPlayAnte = $playAnte;
             }
             $lotteryType = $isPaid ? 0 : 1;
 
@@ -273,29 +277,113 @@ class WeightTestRunner
      */
     private function isAnteRandomMode(DiceRewardConfigRecord $record): bool
     {
-        $snap = $record->tier_weights_snapshot ?? null;
-        if (!is_array($snap)) {
-            return false;
+        $snap = $this->normalizeTierWeightsSnapshot($record->tier_weights_snapshot ?? null);
+        if (is_array($snap) && !empty($snap['ante_random'])) {
+            return true;
         }
+        // 创建随机测试时主表 ante 固定为 0；快照丢失 ante_random 时仍按随机模式执行
+        $recordAnte = is_numeric($record->ante ?? null) ? (int) $record->ante : -1;
 
-        return !empty($snap['ante_random']);
+        return $recordAnte === 0;
     }
 
     /**
-     * 从当前渠道 dice_ante_config 中随机取一条 mult
+     * @param mixed $snap
+     * @return array<string, mixed>|null
+     */
+    private function normalizeTierWeightsSnapshot($snap): ?array
+    {
+        if (is_array($snap)) {
+            return $snap;
+        }
+        if (is_string($snap) && $snap !== '') {
+            $decoded = json_decode($snap, true);
+
+            return is_array($decoded) ? $decoded : null;
+        }
+
+        return null;
+    }
+
+    /**
+     * 解析本局有效底注（dice_ante_config.mult），禁止写入 0
+     */
+    private function resolvePlayAnteMult(
+        int $deptId,
+        int $queuedAnte,
+        bool $isPaid,
+        bool $anteRandom,
+        int $recordAnte,
+        int $lastPaidPlayAnte
+    ): int {
+        if ($isPaid) {
+            if ($anteRandom) {
+                return $this->pickRandomAnteMult($deptId);
+            }
+            if ($queuedAnte > 0) {
+                return $queuedAnte;
+            }
+            if ($recordAnte > 0) {
+                return $recordAnte;
+            }
+
+            return $this->getMinAnteMult($deptId);
+        }
+
+        // 免费券（T5 链式）：与触发付费局同底注，不得为 0
+        if ($queuedAnte > 0) {
+            return $queuedAnte;
+        }
+        if ($lastPaidPlayAnte > 0) {
+            return $lastPaidPlayAnte;
+        }
+        if ($recordAnte > 0) {
+            return $recordAnte;
+        }
+
+        return $this->getMinAnteMult($deptId);
+    }
+
+    /**
+     * 当前渠道底注配置中最小正数 mult
+     */
+    private function getMinAnteMult(int $deptId): int
+    {
+        $mults = $this->listPositiveAnteMults($deptId);
+
+        return $mults !== [] ? $mults[0] : 1;
+    }
+
+    /**
+     * @return list<int>
+     */
+    private function listPositiveAnteMults(int $deptId): array
+    {
+        $anteQuery = DiceAnteConfig::field('mult')->order('mult', 'asc');
+        ConfigScopeEditHelper::applyDeptIdWhere($anteQuery, $deptId);
+        $rows = $anteQuery->select()->toArray();
+        $mults = [];
+        foreach ($rows as $row) {
+            $mult = (int) ($row['mult'] ?? 0);
+            if ($mult > 0) {
+                $mults[] = $mult;
+            }
+        }
+
+        return $mults;
+    }
+
+    /**
+     * 从当前渠道 dice_ante_config 中随机取一条 mult（仅 mult>0）
      */
     private function pickRandomAnteMult(int $deptId): int
     {
-        $anteQuery = DiceAnteConfig::field('id,mult')->order('mult', 'asc');
-        ConfigScopeEditHelper::applyDeptIdWhere($anteQuery, $deptId);
-        $rows = $anteQuery->select()->toArray();
-        if ($rows === []) {
+        $mults = $this->listPositiveAnteMults($deptId);
+        if ($mults === []) {
             return 1;
         }
-        $picked = $rows[random_int(0, count($rows) - 1)];
-        $mult = (int) ($picked['mult'] ?? 0);
 
-        return $mult > 0 ? $mult : 1;
+        return $mults[random_int(0, count($mults) - 1)];
     }
 
     /**
@@ -303,8 +391,8 @@ class WeightTestRunner
      */
     private function resolveTierWeightsSnapshot(DiceRewardConfigRecord $record, string $side): ?array
     {
-        $snap = $record->tier_weights_snapshot ?? null;
-        if (! is_array($snap)) {
+        $snap = $this->normalizeTierWeightsSnapshot($record->tier_weights_snapshot ?? null);
+        if ($snap === null) {
             return null;
         }
         $weights = $snap[$side] ?? null;
@@ -399,6 +487,9 @@ class WeightTestRunner
                 $out[$k] = $row[$k];
             }
         }
+        if (array_key_exists('ante', $out) && (int) ($out['ante'] ?? 0) <= 0) {
+            $out['ante'] = $this->getMinAnteMult($bindDeptId > 0 ? $bindDeptId : $deptId);
+        }
         return $out;
     }