diff --git a/funasr/models/encoder/sanm_encoder.py b/funasr/models/encoder/sanm_encoder.py
index ac4240cdb..e04b9e716 100644
--- a/funasr/models/encoder/sanm_encoder.py
+++ b/funasr/models/encoder/sanm_encoder.py
@@ -945,11 +945,11 @@ class SANMEncoderChunkOpt(AbsEncoder):
 
         for layer_idx, encoder_layer in enumerate(self.encoders):
             encoder_outs = encoder_layer.forward_chunk(xs_pad, new_cache[layer_idx+len(self.encoders0)], cache["chunk_size"], cache["encoder_chunk_look_back"])
-            xs_pad, new_cache[layer_idx+1] = encoder_outs[0], encoder_outs[1]
+            xs_pad, new_cache[layer_idx+len(self.encoders0)] = encoder_outs[0], encoder_outs[1]
 
         if self.normalize_before:
             xs_pad = self.after_norm(xs_pad)
-        if cache["encoder_chunk_look_back"] > 0:
+        if cache["encoder_chunk_look_back"] > 0 or cache["encoder_chunk_look_back"] == -1:
             cache["opt"] = new_cache
 
         return xs_pad, ilens, None
diff --git a/funasr/modules/attention.py b/funasr/modules/attention.py
index f5430e1ca..157a2c50c 100644
--- a/funasr/modules/attention.py
+++ b/funasr/modules/attention.py
@@ -471,15 +471,21 @@ class MultiHeadedAttentionSANM(nn.Module):
 
         """
         q_h, k_h, v_h, v = self.forward_qkv(x)
-        if chunk_size is not None and look_back > 0:
+        if chunk_size is not None and look_back > 0 or look_back == -1:
             if cache is not None:
+                k_h_stride = k_h[:, :, :-(chunk_size[2]), :]
+                v_h_stride = v_h[:, :, :-(chunk_size[2]), :]
                 k_h = torch.cat((cache["k"], k_h), dim=2)
                 v_h = torch.cat((cache["v"], v_h), dim=2)
-                cache["k"] = k_h[:, :, -(look_back * chunk_size[1]):, :]
-                cache["v"] = v_h[:, :, -(look_back * chunk_size[1]):, :]
+
+                cache["k"] = torch.cat((cache["k"], k_h_stride), dim=2)
+                cache["v"] = torch.cat((cache["v"], v_h_stride), dim=2)
+                if look_back != -1:
+                    cache["k"] = cache["k"][:, :, -(look_back * chunk_size[1]):, :]
+                    cache["v"] = cache["v"][:, :, -(look_back * chunk_size[1]):, :]
             else:
-                cache_tmp = {"k": k_h[:, :, -(look_back * chunk_size[1]):, :],
-                             "v": v_h[:, :, -(look_back * chunk_size[1]):, :]}
+                cache_tmp = {"k": k_h[:, :, :-(chunk_size[2]), :],
+                             "v": v_h[:, :, :-(chunk_size[2]), :]}
                 cache = cache_tmp
         fsmn_memory = self.forward_fsmn(v, None)
         q_h = q_h * self.d_k ** (-0.5)