diff --git a/lib/gacha.js b/lib/gacha.js
index 4d689f4..2b87279 100644
--- a/lib/gacha.js
+++ b/lib/gacha.js
@@ -199,6 +199,8 @@ export const anaylizeGachaLog = async uid => {
     let avgFive = '-';
     // 初始化平均UP次数
     let avgUp = '-';
+    // 小保底不歪的概率
+    let noWai = '-';
     // 初始化欧非等级
     let level = 2;
     // 如果有数据
@@ -210,6 +212,10 @@ export const anaylizeGachaLog = async uid => {
         avgFive = ((totalCount - lastFive) / fiveStars).toFixed(1);
       // 计算平均UP次数
       if (upCount > 0) avgUp = ((totalCount - lastFive) / upCount).toFixed(1);
+      // 计算小保底不歪的概率
+      if (+avgFive && +avgUp) {
+        noWai = ((2 - +avgUp / +avgFive) * 100).toFixed(0) + '%';
+      }
     }
     // 如果没有最后五星
     if (!lastFive && fiveStars === 0) {
@@ -249,6 +255,7 @@ export const anaylizeGachaLog = async uid => {
       totalCount,
       avgFive,
       avgUp,
+      noWai,
       level,
       tag,
       emoji,
diff --git a/resources/gachalog/index.html b/resources/gachalog/index.html
index 53d9c72..b399759 100644
--- a/resources/gachalog/index.html
+++ b/resources/gachalog/index.html
@@ -28,6 +28,12 @@
           <div class="value">{{item.totalCount}}</div>
           <div class="label">抽卡总数</div>
         </div>
+        {{if (item.name === '音擎频段' || item.name === '独家频段')}}
+          <div class="item">
+          <div class="value">{{item.noWai}}</div>
+          <div class="label">不歪率</div>
+        </div>
+        {{/if}}
       </div>
     </div>
     <div class="comment e{{item.emoji}}">