diff --git a/csst/msc/astrometry.py b/csst/msc/astrometry.py
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..8a4e5d8d2a53c1188c0a0382389facfa8936bd20 100644
--- a/csst/msc/astrometry.py
+++ b/csst/msc/astrometry.py
@@ -0,0 +1,18 @@
+from ..core.processor import CsstProcessor
+
+
+class CsstProcMscPositionCalibration(CsstProcessor):
+    def prepare(self, **args):
+        # prepare the environment
+        # for example, if you make use of some third-party software like SEXTRACTOR,
+        # do your preparation here.
+        pass
+
+    def run(self, data, *args, **kwargs):
+        # run your pipeline here
+        # make sure that your input data should be a child class instance of CsstData.
+        pass
+
+    def cleanup(self, **kwargs):
+        # clean up environment
+        pass