diff --git a/csst_common/data_manager.py b/csst_common/data_manager.py
index 4c0979caf41028bd60dcf42c90774a73534a55ac..58625971a30e58f6dfaeeafeecf01cfd122ee265 100644
--- a/csst_common/data_manager.py
+++ b/csst_common/data_manager.py
@@ -26,8 +26,8 @@ from csst_dfs_api.msc.level0 import Level0DataApi
 from csst_dfs_api.msc.level0prc import Level0PrcApi
 from csst_dfs_api.msc.level1 import Level1DataApi
 from csst_dfs_api.msc.level2 import Level2DataApi
+from csst_dfs_api.common.catalog import CatalogApi
 
-from .dfs import gaia_query_from_dfs
 from .logger import get_logger
 from .params import CSST_PARAMS as CP
 from .params import DFS_CONF
@@ -248,6 +248,10 @@ class CsstMsDataManager:
     def dfs_CalApi(self):
         return CalMergeApi()
 
+    @property
+    def dfs_CatApi(self):
+        return CatalogApi()
+
     def set_env(self):
         """ set environment variables """
         if os.uname()[1] == "dandelion":
@@ -567,17 +571,21 @@ class CsstMsDataManager:
     def dfs_is_available():
         """ Test if DFS works. """
         try:
-            tbl = gaia_query_from_dfs(radius=0.001)
-            assert len(tbl) == 0
-            return True
+            tbl = CatalogApi().catalog_query(
+                catalog_name="gaia3", ra=180, dec=0, radius=.1, min_mag=0, max_mag=30, obstime=-1, limit=-1
+            )
+            return len(tbl) > 0
         except:
             return False
 
     def dfs_rc_query(self, ra=180, dec=0, radius=2, min_mag=0, max_mag=30, obstime=-1, limit=-1):
         """ Query Reference Catalog (RC) from DFS. """
         try:
-            tbl = gaia_query_from_dfs(
-                ra=ra, dec=dec, radius=radius, min_mag=min_mag, max_mag=max_mag, obstime=obstime, limit=limit)
+            cat = self.dfs_CatApi.catalog_query(
+                catalog_name="gaia3", ra=ra, dec=dec, radius=radius, min_mag=min_mag, max_mag=max_mag,
+                obstime=obstime, limit=limit
+            )
+            tbl = self.dfs_CatApi.to_table(cat)
             return tbl
         except:
             print("Error occurred during the query!")
@@ -686,14 +694,3 @@ class CsstMsDataManager:
 
 # temporarily compatible with old interface
 CsstMbiDataManager = CsstMsDataManager
-
-
-def test_dm():
-    import joblib
-    from csst_common.data_manager import CsstMsDataManager
-    dm = CsstMsDataManager(dfs_node="pml")
-
-    def f(dm, a=1):
-        print(a)
-
-    joblib.Parallel(n_jobs=10, )(joblib.delayed(f)(dm) for i in range(10))
diff --git a/csst_common/dfs.py b/csst_common/dfs.py
deleted file mode 100644
index 66e0ffdd6b2451de02db1d1c95155648f27eb056..0000000000000000000000000000000000000000
--- a/csst_common/dfs.py
+++ /dev/null
@@ -1,51 +0,0 @@
-import os
-from csst_dfs_api.common.catalog import CatalogApi
-from csst_dfs_api.msc.level1 import Level1DataApi
-
-
-# DFS query
-def gaia_query_from_dfs(ra=180, dec=0, radius=2, min_mag=0, max_mag=30, obstime=-1, limit=-1):
-    """ query gaia edr3 catalog from dfs """
-    api = CatalogApi()
-    cat = api.catalog_query(
-        catalog_name="gaia3", ra=ra, dec=dec, radius=radius, min_mag=min_mag, max_mag=max_mag,
-        obstime=obstime, limit=limit
-    )
-    tbl = api.to_table(cat)
-    return tbl
-
-
-def get_l1api(node="pm"):
-    """ get DFS L1 API
-
-    Parameters
-    ----------
-    node: str
-        in present, node has to be "pm"
-
-    Returns
-    -------
-    DFS L1 API
-
-    Examples
-    --------
-    >>>
-    >>> rec = l1api.write(
-    >>>     level0_id='10000000020',
-    >>>     data_type = "sci",
-    >>>     cor_sci_id = 1,
-    >>>     prc_status = 3,
-    >>>     prc_time = '2022-01-05 15:18:13',
-    >>>     filename = "MSC_MS_210525120000_100000000_20_img.fits",
-    >>>     file_path = "/nfs/data/test20211012/output/L1/150s/MSC_MS_210525120000_100000000_20_img.fits",
-    >>>     pipeline_id = "P1_test",
-    >>>     refs = {})
-    >>> print('write:', rec)
-    """
-    l1api = Level1DataApi()
-    return l1api
-
-
-if __name__ == "__main__":
-    tbl = gaia_query_from_dfs()
-    print(tbl)