diff --git a/funasr/models/predictor/cif.py b/funasr/models/predictor/cif.py
index c28146062..c34759d0d 100644
--- a/funasr/models/predictor/cif.py
+++ b/funasr/models/predictor/cif.py
@@ -598,7 +598,8 @@ class CifPredictorV3(nn.Module):
             mask_2 = torch.cat([ones_t, mask], dim=1)
             mask = mask_2 - mask_1
             tail_threshold = mask * tail_threshold
-            alphas = torch.cat([alphas, tail_threshold], dim=1)
+            alphas = torch.cat([alphas, zeros_t], dim=1)
+            alphas = torch.add(alphas, tail_threshold)
         else:
             tail_threshold = torch.tensor([tail_threshold], dtype=alphas.dtype).to(alphas.device)
             tail_threshold = torch.reshape(tail_threshold, (1, 1))