diff --git a/examples/high_freq/workflow.py b/examples/high_freq/workflow.py
index 8304cf26a..eb30fb1b8 100644
--- a/examples/high_freq/workflow.py
+++ b/examples/high_freq/workflow.py
@@ -24,48 +24,6 @@ from qlib.data.data import Cal
 
 from highfreq_ops import DayFirst, DayLast, FFillNan, Date, Select, IsNull
 
-
-def save_dataset(dataset, path: [Path, str]):
-    """
-    save dataset to path
-
-    Parameters
-    ----------
-    path : [Path, str]
-        path to save
-    """
-    dataset.to_pickle(path=path)
-
-
-def load_dataset(path: [Path, str], init_type=DataHandlerLP.IT_LS):
-    """
-    load dataset from path
-
-    Parameters
-    ----------
-    path : [Path, str]
-        path to load
-
-    init_type : str
-        - if `init_type` == DataHandlerLP.IT_FIT_SEQ:
-
-            the input of `DataHandlerLP.fit` will be the output of the previous processor
-
-        - if `init_type` == DataHandlerLP.IT_FIT_IND:
-
-            the input of `DataHandlerLP.fit` will be the original df
-
-        - if `init_type` == DataHandlerLP.IT_LS:
-
-            The state of the object has been load by pickle
-    """
-    fd = open(path, "rb")
-    dataset = pickle.load(fd)
-    dataset.init(init_type=init_type)
-    fd.close()
-    return dataset
-
-
 if __name__ == "__main__":
 
     # use default data
@@ -78,7 +36,7 @@ if __name__ == "__main__":
         auto_mount=False,
     )
 
-    MARKET = "test_10"
+    MARKET = "all"
     BENCHMARK = "SH000300"
 
     start_time = "2019-01-01 00:00:00"