diff --git a/csst_common/logger.py b/csst_common/logger.py
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index 0000000000000000000000000000000000000000..e615e839d99f3920cb0a1866231915c09909cc1d
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+++ b/csst_common/logger.py
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+"""
+Identifier:     KSC-SJ4-csst_common/logger.py
+Name:           logger.py
+Description:    CSST logger
+Author:         Bo Zhang
+Created:        2022-10-04
+Modified-History:
+    2022-10-04, Bo Zhang, created
+    2022-10-04, Bo Zhang, added get_logger
+"""
+import logging
+
+
+def get_logger(name="CSST MS L1 Pipeline", filename=""):
+    """ get a logger for CSST L1 Pipeline
+    Messages with levels >= DEBUG will be output by stream.
+    Messages with levels >= INFO will be recorded by a log file.
+
+    Parameters
+    ----------
+    name: str
+        logger name
+    filename: str
+        log file name
+
+    Returns
+    -------
+
+    References
+    ----------
+    for logging: https://docs.python.org/3/library/logging.html
+    for logging levels, conf: https://docs.python.org/3/library/logging.html#logging-levels
+
+    """
+    # initialize logger
+    logger = logging.getLogger(name=name)
+    logger.setLevel(logging.DEBUG)
+
+    # logging formatter
+    formatter = logging.Formatter("%(asctime)s - %(levelname)s - %(module)s.py:%(lineno)d - %(message)s")
+
+    # stream handler
+    stream_handler = logging.StreamHandler()
+    stream_handler.setFormatter(formatter)
+    stream_handler.setLevel(logging.DEBUG)
+    logger.addHandler(stream_handler)
+
+    # file handler
+    if filename != "":
+        file_handler = logging.FileHandler(filename=filename, encoding="utf-8")
+        file_handler.setFormatter(formatter)
+        file_handler.setLevel(logging.INFO)
+        logger.addHandler(file_handler)
+
+    return logger
+
+
+if __name__ == "__main__":
+    import os
+    print(os.getcwd())
+    logger = get_logger(filename="test_logger.log")
+    print(type(logger), logger.name)
+    logger.debug("Well ..")
+    logger.info("Hello ...")
+    logger.warning("There ...")
+    logger.error("Good morning ...")