diff --git a/csst_dfs_api/facility/level1.py b/csst_dfs_api/facility/level1.py
index 98ecb1a3c91ffdff3434b74d0e99a1dd7f18788b..6ad58f657c9beac880fd3dd1174ac4317ce16c68 100644
--- a/csst_dfs_api/facility/level1.py
+++ b/csst_dfs_api/facility/level1.py
@@ -20,6 +20,9 @@ class Level1DataApi(object):
             qc1_status : [int],
             prc_status : [int],
             filename: [str]
+            ra_cen: float = None,
+            dec_cen: float = None,
+            radius_cen: float = None,            
             limit: limits returns the number of records,default 0:no-limit
         
         :returns: csst_dfs_common.models.Result
@@ -35,6 +38,17 @@ class Level1DataApi(object):
         '''
         return self.stub.find_by_brick_ids(**kwargs)
 
+    def sls_find_by_qc1_status(self, **kwargs):
+        ''' retrieve level1 records from database
+
+        :param kwargs: Parameter dictionary, key items support:
+            qc1_status : [int],
+            limit: limits returns the number of records,default 1
+        
+        :returns: csst_dfs_common.models.Result
+        '''
+        return self.stub.sls_find_by_qc1_status(**kwargs)
+
     def get(self, **kwargs):
         '''  fetch a record from database
 
diff --git a/csst_dfs_api/functional/__init__.py b/csst_dfs_api/functional/__init__.py
index 793a1fe78cf94b509cb0f543dd3101444009d34b..90f2544d67ff660716aac709df5a3b475472e2e3 100644
--- a/csst_dfs_api/functional/__init__.py
+++ b/csst_dfs_api/functional/__init__.py
@@ -1,14 +1,14 @@
-from ..facility import ObservationApi, Level0DataApi
+from ..facility import ObservationApi, Level0DataApi, Level1DataApi
 from csst_dfs_commons.models import Result
 
 def find_observation(
-            module_id: str = None,
-            obs_type: str = None,
-            obs_time : tuple = (None, None),
-            qc0_status : int = -1,
-            prc_status : int = -1) -> Result:
-    kwarg = locals()
-    return ObservationApi().find(**kwarg)   
+			module_id: str = None,
+			obs_type: str = None,
+			obs_time : tuple = (None, None),
+			qc0_status : int = -1,
+			prc_status : int = -1) -> Result:
+	kwarg = locals()
+	return ObservationApi().find(**kwarg)   
 
 def find_level0(obs_id: str = '',
             module_id: str = '',
@@ -23,6 +23,25 @@ def find_level0(obs_id: str = '',
             dec_obj: float = None,
             radius: float = None,
             object_name: str = None,
-            version: str = None) -> Result:
+            version: str = None,
+			limit: int = 0) -> Result:
+    kwarg = locals()
+    return Level0DataApi().find(**kwarg)
+
+def find_level1(level0_id: str = '',
+            module_id: str = '',
+            data_type: str = '',
+            create_time : tuple = (None, None),
+            qc1_status : int = None,
+            prc_status : int = None,
+            file_name: str = '',
+            ra_cen: float = None,
+            dec_cen: float = None,
+            radius_cen: float = None,
+			limit: int = 0) -> Result:
+    kwarg = locals()
+    return Level1DataApi().find(**kwarg)
+
+def find_sls_by_qc1_status(qc1_status: int = -1, limit: int = 1) -> Result:
     kwarg = locals()
-    return Level0DataApi().find(**kwarg)
\ No newline at end of file
+    return Level1DataApi().sls_find_by_qc1_status(**kwarg)	
\ No newline at end of file
diff --git a/tests/sls/test_sls_level1.py b/tests/sls/test_sls_level1.py
new file mode 100644
index 0000000000000000000000000000000000000000..05191edf612f44ae02a9a653de296e39c7199d7e
--- /dev/null
+++ b/tests/sls/test_sls_level1.py
@@ -0,0 +1,22 @@
+import os
+import unittest
+from astropy.io import fits
+
+from csst_dfs_api.facility.level1 import Level1DataApi
+
+class SLSLevel1DataTestCase(unittest.TestCase):
+
+    def setUp(self):
+        self.api = Level1DataApi()
+
+    def test_find_by_qc1_status(self):
+        recs = self.api.sls_find_by_qc1_status(qc1_status=-1)
+        print('find_by_qc1_status:', recs)
+
+    def test_find(self):
+        recs = self.api.find(
+            ra_cen = 1,
+            dec_cen =2,
+            radius_cen = 1
+        )
+        print('find:', recs)