diff --git a/game-server/app/services/battleService.ts b/game-server/app/services/battleService.ts
index ab1a76fbc..fb8566a8c 100644
--- a/game-server/app/services/battleService.ts
+++ b/game-server/app/services/battleService.ts
@@ -5,7 +5,7 @@ import { HANG_UP_CONSTS, TOWER_TASK_CONST, REDIS_KEY, TASK_TYPE, TIME_OUTPUT_TYP
 import { BattleRecordModel } from './../db/BattleRecord';
 import { TowerRecordModel } from './../db/TowerRecord';
 import { RoleModel, RoleType } from './../db/Role';
-import { shouldRefresh, resResult, cal, getRandEelmWithWeight, calculateNum, genCode } from '../pubUtils/util';
+import { shouldRefresh, resResult, cal, getRandEelmWithWeight, calculateNum, genCode, getRandEelm } from '../pubUtils/util';
 import { STATUS } from '../consts/statusCode';
 import { HangUpSpdUpRecModel } from '../db/HangUpSpdUpRec';
 import { TowerTaskRecModel, TowerTaskRecType } from '../db/TowerTaskRec';
@@ -378,6 +378,8 @@ export async function checkTaskConditions(roleId: string, heroes: number[], cond
 }
 
 export async function refreshTasks(towerLv: number, batchCode: string, roleId: string, roleName: string, oldTasks:TowerTaskRecType[]) {
+    let needFloor = !oldTasks || oldTasks.length <= 0; // 首次刷新需要一个保底
+
     let ridTaskIds: number[] = [];
     let positions = new Map<number, TowerTaskRecType> (); // 需要创建或更新
     for(let i = 1; i <= TOWER_TASK_CONST.RAND_CNT; i++) { // TODO 改为系统参数表
@@ -394,7 +396,13 @@ export async function refreshTasks(towerLv: number, batchCode: string, roleId: s
 
     let tasks: TowerTaskRecType[] = [];
     for(let [ position, task ] of positions) {
-        let taskId = randomTaskId(towerLv, task?task.taskId: 0, ridTaskIds);
+        let dicOldTask = task? gameData.towerTask.get(task.taskId): null;
+
+        let dicTask = randomTask(towerLv, dicOldTask?dicOldTask.quality: 0, ridTaskIds);
+        if(!dicTask) break; // 任务池没有可刷新了
+
+        let { taskId, quality } = dicTask;
+        if(quality == 4 || quality == 5) needFloor = false;
         if(task) { // 更新
             tasks.push(await TowerTaskRecModel.updateTask(roleId, batchCode, position, taskId));
         } else {
@@ -402,18 +410,25 @@ export async function refreshTasks(towerLv: number, batchCode: string, roleId: s
         }
         ridTaskIds.push(taskId);
     }
+
+
+    if(needFloor) { // 塞一个保底
+        let dicTask = randomTask(towerLv, 3, ridTaskIds);
+        if(dicTask) {
+            let index = Math.floor(Math.random() * tasks.length);
+            tasks[index] = await TowerTaskRecModel.updateTask(roleId, batchCode, tasks[index].position, dicTask.taskId);
+        }
+    }
+
     return tasks
 }
 
-function randomTaskId(towerLv: number, oldTaskId: number, rids: number[]) {
-    let dicTask = gameData.towerTask;
-    let oldQuality = dicTask.has(oldTaskId)? dicTask.get(oldTaskId).quality: 0;
+function randomTask(towerLv: number, oldQuality: number, rids: number[]) {
     let qualityRange = oldQuality + 1;
-    if(qualityRange >=5 ) qualityRange = 5;
 
     let randomList: DicTowerTask[] = [];
     while(randomList.length <= 0) { // 如果这个品质范围里面没有，就降一品质再找
-        for (let [_id, task] of dicTask) {
+        for (let [_id, task] of gameData.towerTask) {
             if(task.quality >= qualityRange && !rids.includes(task.taskId)) {
                 let { suitFloor: { min, max } } = task;
                 let flag = max ? (towerLv >= min && towerLv <= max) : (towerLv >= min);
@@ -423,12 +438,12 @@ function randomTaskId(towerLv: number, oldTaskId: number, rids: number[]) {
             }
         }
         if(randomList.length <= 0) qualityRange--;
-        if(qualityRange == 0) return 0;
+        if(qualityRange == 0) return null;
     }
 
     let { dic } = getRandEelmWithWeight(randomList);
     
-    return dic.taskId;
+    return dic;
 }
 
 // /**
diff --git a/shared/db/TowerTaskRec.ts b/shared/db/TowerTaskRec.ts
index 349fa4259..54205bf54 100644
--- a/shared/db/TowerTaskRec.ts
+++ b/shared/db/TowerTaskRec.ts
@@ -73,7 +73,7 @@ export default class TowerTaskRec extends BaseModel {
   }
 
   public static async updateTask(roleId: string, batchCode: string, position: number, taskId: number) {
-    const recs: TowerTaskRecType = await TowerTaskRecModel.findOneAndUpdate({ roleId, batchCode, position, status: TOWER_TASK_STATUS.WAITING }, { $set: { taskId } }).lean();
+    const recs: TowerTaskRecType = await TowerTaskRecModel.findOneAndUpdate({ roleId, batchCode, position, status: TOWER_TASK_STATUS.WAITING }, { $set: { taskId } }, { new: true }).lean();
     return recs;
   }