diff --git a/internal/model/voice_room_red_packet_models.go b/internal/model/voice_room_red_packet_models.go
index 66dcaf1..3769901 100644
--- a/internal/model/voice_room_red_packet_models.go
+++ b/internal/model/voice_room_red_packet_models.go
@@ -76,12 +76,12 @@ func (VoiceRoomRedPacket) TableName() string { return "voice_room_red_packet" }
 
 // VoiceRoomRedPacketSlice 保存红包预拆分份额。
 type VoiceRoomRedPacketSlice struct {
-	ID            int64     `gorm:"column:id;primaryKey"`
-	PacketID      int64     `gorm:"column:packet_id;uniqueIndex:uk_voice_room_red_packet_slice,priority:1;index:idx_voice_room_red_packet_slice_claim,priority:1"`
+	ID            int64     `gorm:"column:id;primaryKey;index:idx_voice_room_red_packet_slice_claim_order,priority:4"`
+	PacketID      int64     `gorm:"column:packet_id;uniqueIndex:uk_voice_room_red_packet_slice,priority:1;index:idx_voice_room_red_packet_slice_claim,priority:1;index:idx_voice_room_red_packet_slice_claim_order,priority:1"`
 	PacketNo      string    `gorm:"column:packet_no;size:64"`
-	SortNo        int       `gorm:"column:sort_no;uniqueIndex:uk_voice_room_red_packet_slice,priority:2"`
+	SortNo        int       `gorm:"column:sort_no;uniqueIndex:uk_voice_room_red_packet_slice,priority:2;index:idx_voice_room_red_packet_slice_claim_order,priority:3"`
 	Amount        int64     `gorm:"column:amount"`
-	Status        string    `gorm:"column:status;size:32;index:idx_voice_room_red_packet_slice_claim,priority:2"`
+	Status        string    `gorm:"column:status;size:32;index:idx_voice_room_red_packet_slice_claim,priority:2;index:idx_voice_room_red_packet_slice_claim_order,priority:2"`
 	ClaimUserID   *int64    `gorm:"column:claim_user_id"`
 	ClaimRecordID *int64    `gorm:"column:claim_record_id"`
 	CreateTime    time.Time `gorm:"column:create_time"`
diff --git a/internal/service/voiceroomredpacket/claim.go b/internal/service/voiceroomredpacket/claim.go
index ec80332..4f83ce7 100644
--- a/internal/service/voiceroomredpacket/claim.go
+++ b/internal/service/voiceroomredpacket/claim.go
@@ -182,6 +182,12 @@ func (s *Service) completeClaimWallet(ctx context.Context, claim model.VoiceRoom
 		}
 		now := time.Now()
 		if err := s.db.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
+			var lockedPacket model.VoiceRoomRedPacket
+			if err := tx.Clauses(clause.Locking{Strength: "UPDATE"}).
+				Where("id = ?", claim.PacketID).
+				First(&lockedPacket).Error; err != nil {
+				return err
+			}
 			if err := tx.Model(&model.VoiceRoomRedPacketClaim{}).
 				Where("id = ?", claim.ID).
 				Updates(map[string]any{
@@ -200,7 +206,7 @@ func (s *Service) completeClaimWallet(ctx context.Context, claim model.VoiceRoom
 				return err
 			}
 			return tx.Model(&model.VoiceRoomRedPacket{}).
-				Where("id = ? AND remain_count = 0 AND status = ?", claim.PacketID, packetStatusActive).
+				Where("id = ? AND remain_count = 0 AND status = ?", lockedPacket.ID, packetStatusActive).
 				Updates(map[string]any{
 					"status":      packetStatusFinished,
 					"update_time": now,
diff --git a/migrations/050_voice_room_red_packet_slice_claim_order_index.sql b/migrations/050_voice_room_red_packet_slice_claim_order_index.sql
new file mode 100644
index 0000000..ddf08ab
--- /dev/null
+++ b/migrations/050_voice_room_red_packet_slice_claim_order_index.sql
@@ -0,0 +1,29 @@
+SET @current_schema := DATABASE();
+
+SET @voice_room_red_packet_slice_claim_order_idx_columns := (
+  SELECT GROUP_CONCAT(column_name ORDER BY seq_in_index)
+  FROM information_schema.statistics
+  WHERE table_schema = @current_schema
+    AND table_name = 'voice_room_red_packet_slice'
+    AND index_name = 'idx_voice_room_red_packet_slice_claim_order'
+);
+
+SET @drop_voice_room_red_packet_slice_claim_order_idx_sql := IF(
+  @voice_room_red_packet_slice_claim_order_idx_columns IS NOT NULL
+    AND @voice_room_red_packet_slice_claim_order_idx_columns <> 'packet_id,status,sort_no,id',
+  'ALTER TABLE `voice_room_red_packet_slice` DROP INDEX `idx_voice_room_red_packet_slice_claim_order`',
+  'SELECT 1'
+);
+PREPARE drop_voice_room_red_packet_slice_claim_order_idx_stmt FROM @drop_voice_room_red_packet_slice_claim_order_idx_sql;
+EXECUTE drop_voice_room_red_packet_slice_claim_order_idx_stmt;
+DEALLOCATE PREPARE drop_voice_room_red_packet_slice_claim_order_idx_stmt;
+
+SET @add_voice_room_red_packet_slice_claim_order_idx_sql := IF(
+  @voice_room_red_packet_slice_claim_order_idx_columns IS NULL
+    OR @voice_room_red_packet_slice_claim_order_idx_columns <> 'packet_id,status,sort_no,id',
+  'ALTER TABLE `voice_room_red_packet_slice` ADD INDEX `idx_voice_room_red_packet_slice_claim_order` (`packet_id`, `status`, `sort_no`, `id`)',
+  'SELECT 1'
+);
+PREPARE add_voice_room_red_packet_slice_claim_order_idx_stmt FROM @add_voice_room_red_packet_slice_claim_order_idx_sql;
+EXECUTE add_voice_room_red_packet_slice_claim_order_idx_stmt;
+DEALLOCATE PREPARE add_voice_room_red_packet_slice_claim_order_idx_stmt;