diff --git a/tests/test_epoch.py b/tests/test_epoch.py
new file mode 100644
index 0000000000000000000000000000000000000000..2d7a4908269651a91c1ca8b35e84eae8388ba545
--- /dev/null
+++ b/tests/test_epoch.py
@@ -0,0 +1,48 @@
+"""
+Identifier:     csst-l1/msc/csst_msc_common/csst_msc_commn/tests/test_epoch.py
+Name:           test_epoch.py
+Description:    Coordinates system transformation due to motion according to the CSST orbit parameters.
+Author:         Zihuang Cao (zhcao@nao.cas.cn), Jundan Nie (jdnie@nao.cas.cn)
+Created:        2023-12-12
+Modified-History:
+    2023-12-12, Zihuang Cao, created
+    2023-12-19, Zihuang Cao, added fault tolerance mechanism.
+"""
+
+import unittest
+from astropy.io import fits
+from epoch import get_refcat_onOrbit
+import sys
+import os
+
+filename = "gaia_dfs.fits"
+common_path = "/nfsdata/share/pipeline-unittest/csst_msc_common/catalog"
+
+
+class PositionTest(unittest.TestCase):
+    def test_epoch_onorbit(self):
+        """
+        Aim
+        ---
+        Test on epoch converstion on orbit, process on a catalog.
+
+        Criteria
+        --------
+        Get the corrected sky coordinates list.
+
+        Details
+        --------
+        This test is used to test the calculation for c6.2 version data.
+        """
+        input_catalog_abspath = os.path.join(common_path, filename)
+        if not os.path.exists(input_catalog_abspath):
+            input_catalog_abspath = os.path.join("./", filename)
+        hdulist = fits.open(input_catalog_abspath)
+        catalog_table = hdulist[1].data
+        cur_obs_skyCoord_list = get_refcat_onOrbit(catalog_table)
+        hdulist.close()
+        print("test_epoch_onorbit passed !!")
+
+
+if __name__ == "__main__":
+    unittest.main()