diff --git a/funasr/datasets/audio_datasets/index_ds.py b/funasr/datasets/audio_datasets/index_ds.py
index 06bd4de16..2677d3348 100644
--- a/funasr/datasets/audio_datasets/index_ds.py
+++ b/funasr/datasets/audio_datasets/index_ds.py
@@ -34,7 +34,7 @@ class IndexDSJsonlRankFull(torch.utils.data.Dataset):
             with open(path, encoding='utf-8') as fin:
                 file_list_all = fin.readlines()
     
-                num_per_slice = len(file_list_all) // data_split_num
+                num_per_slice = (len(file_list_all)-1) // data_split_num + 1
                 file_list = file_list_all[data_split_i * num_per_slice:(data_split_i + 1) * num_per_slice]
                 logging.info(
                     f"is_training: {is_training}, data_split_num: {data_split_num}, data_split_i: {data_split_i}, \nfile_list: {file_list}, \nfile_list_all: {file_list_all}")