diff --git a/tests/test_fits_header_ops.py b/tests/test_fits_header_ops.py
index 3f0d64176fc6fbe09a429b6ee0c8b6a228963690..efc8b257160fcfae89ded8f5aed10de028d722a8 100644
--- a/tests/test_fits_header_ops.py
+++ b/tests/test_fits_header_ops.py
@@ -8,11 +8,12 @@ Modified-History:
     2023-12-15, Bo Zhang, add TestFitsHeaderOps.test_append_header
     2023-12-15, Bo Zhang, add TestFitsHeaderOps.test_reformat_header
 """
+
 import unittest
 
 from astropy.io import fits
 
-from csst_common.io import append_header, reformat_header
+from csst_common.io import append_header, reformat_header, delete_section
 
 
 class TestFitsHeaderOps(unittest.TestCase):
@@ -100,3 +101,20 @@ class TestFitsHeaderOps(unittest.TestCase):
             tuple(h_rfmt.keys()),
             ("COMMENT", "COMMENT", "COMMENT", "A", "SIMPLE", "NAXIS1"),
         )
+
+    def test_delete_section(self):
+        h = fits.Header()
+        h.add_comment("A")
+        h.add_comment("B")
+        h.add_comment("C")
+        h.set("SIMPLE", True)
+        h.set("NAXIS1", 1)
+        h.add_comment("======")
+        h.add_comment("WCS")
+        h.add_comment("======")
+        h.set("A", 1)
+        h.add_comment("======")
+        h.add_comment("======")
+
+        h_del = delete_section(h, title="WCS")
+        self.assertEqual(len(h_del.cards), 7)