diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/notification/stack/NotificationStackScrollLayout.java b/packages/SystemUI/src/com/android/systemui/statusbar/notification/stack/NotificationStackScrollLayout.java
index b81cb2be1c4d6..3619915433789 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/notification/stack/NotificationStackScrollLayout.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/notification/stack/NotificationStackScrollLayout.java
@@ -4688,6 +4688,7 @@ public class NotificationStackScrollLayout extends ViewGroup implements Dumpable
         if (v instanceof ExpandableNotificationRow && !mController.isShowingEmptyShadeView()) {
             mController.updateShowEmptyShadeView();
             updateFooter();
+            mController.updateImportantForAccessibility();
         }
 
         updateSpeedBumpIndex();
@@ -4699,6 +4700,7 @@ public class NotificationStackScrollLayout extends ViewGroup implements Dumpable
         if (v instanceof ExpandableNotificationRow && mController.isShowingEmptyShadeView()) {
             mController.updateShowEmptyShadeView();
             updateFooter();
+            mController.updateImportantForAccessibility();
         }
 
         updateSpeedBumpIndex();
@@ -4711,6 +4713,7 @@ public class NotificationStackScrollLayout extends ViewGroup implements Dumpable
         if (v instanceof ExpandableNotificationRow && mController.isShowingEmptyShadeView()) {
             mController.updateShowEmptyShadeView();
             updateFooter();
+            mController.updateImportantForAccessibility();
         }
 
         updateSpeedBumpIndex();
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/notification/stack/NotificationStackScrollLayoutController.java b/packages/SystemUI/src/com/android/systemui/statusbar/notification/stack/NotificationStackScrollLayoutController.java
index 7b046d6c92565..9272c376d4feb 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/notification/stack/NotificationStackScrollLayoutController.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/notification/stack/NotificationStackScrollLayoutController.java
@@ -327,6 +327,7 @@ public class NotificationStackScrollLayoutController {
                     mView.updateSensitiveness(mStatusBarStateController.goingToFullShade(),
                             mLockscreenUserManager.isAnyProfilePublicMode());
                     mView.onStatePostChange(mStatusBarStateController.fromShadeLocked());
+                    updateImportantForAccessibility();
                 }
             };
 
@@ -1205,6 +1206,7 @@ public class NotificationStackScrollLayoutController {
         if (mView.getVisibility() == View.VISIBLE) {
             // Synchronize EmptyShadeView visibility with the parent container.
             updateShowEmptyShadeView();
+            updateImportantForAccessibility();
         }
     }
 
@@ -1231,6 +1233,22 @@ public class NotificationStackScrollLayoutController {
         Trace.endSection();
     }
 
+    /**
+     * Update the importantForAccessibility of NotificationStackScrollLayout.
+     * <p>
+     * We want the NSSL to be unimportant for accessibility when there's no
+     * notifications in it while the device is on lock screen, to avoid unlablel NSSL view.
+     * Otherwise, we want it to be important for accessibility to enable accessibility
+     * auto-scrolling in NSSL.
+     */
+    public void updateImportantForAccessibility() {
+        if (getVisibleNotificationCount() == 0 && mView.onKeyguard()) {
+            mView.setImportantForAccessibility(View.IMPORTANT_FOR_ACCESSIBILITY_NO);
+        } else {
+            mView.setImportantForAccessibility(View.IMPORTANT_FOR_ACCESSIBILITY_YES);
+        }
+    }
+
     /**
      * @return true if {@link StatusBarStateController} is in transition to the KEYGUARD
      * and false otherwise.
diff --git a/packages/SystemUI/tests/src/com/android/systemui/statusbar/notification/stack/NotificationStackScrollLayoutControllerTest.java b/packages/SystemUI/tests/src/com/android/systemui/statusbar/notification/stack/NotificationStackScrollLayoutControllerTest.java
index 6a0e3c6d51eb0..02666e40b98d7 100644
--- a/packages/SystemUI/tests/src/com/android/systemui/statusbar/notification/stack/NotificationStackScrollLayoutControllerTest.java
+++ b/packages/SystemUI/tests/src/com/android/systemui/statusbar/notification/stack/NotificationStackScrollLayoutControllerTest.java
@@ -35,6 +35,7 @@ import static org.mockito.Mockito.when;
 import android.content.res.Resources;
 import android.metrics.LogMaker;
 import android.testing.AndroidTestingRunner;
+import android.view.View;
 
 import androidx.test.filters.SmallTest;
 
@@ -430,6 +431,84 @@ public class NotificationStackScrollLayoutControllerTest extends SysuiTestCase {
         verify(mNotificationStackScrollLayout).setStatusBarState(KEYGUARD);
     }
 
+    @Test
+    public void updateImportantForAccessibility_noChild_onKeyGuard_notImportantForA11y() {
+        // GIVEN: Controller is attached, active notifications is empty,
+        // and mNotificationStackScrollLayout.onKeyguard() is true
+        initController(/* viewIsAttached= */ true);
+        when(mNotificationStackScrollLayout.onKeyguard()).thenReturn(true);
+        mController.getNotifStackController().setNotifStats(NotifStats.getEmpty());
+
+        // WHEN: call updateImportantForAccessibility
+        mController.updateImportantForAccessibility();
+
+        // THEN: mNotificationStackScrollLayout should not be important for A11y
+        verify(mNotificationStackScrollLayout)
+                .setImportantForAccessibility(View.IMPORTANT_FOR_ACCESSIBILITY_NO);
+    }
+
+    @Test
+    public void updateImportantForAccessibility_hasChild_onKeyGuard_importantForA11y() {
+        // GIVEN: Controller is attached, active notifications is not empty,
+        // and mNotificationStackScrollLayout.onKeyguard() is true
+        initController(/* viewIsAttached= */ true);
+        when(mNotificationStackScrollLayout.onKeyguard()).thenReturn(true);
+        mController.getNotifStackController().setNotifStats(
+                new NotifStats(
+                        /* numActiveNotifs = */ 1,
+                        /* hasNonClearableAlertingNotifs = */ false,
+                        /* hasClearableAlertingNotifs = */ false,
+                        /* hasNonClearableSilentNotifs = */ false,
+                        /* hasClearableSilentNotifs = */ false)
+        );
+
+        // WHEN: call updateImportantForAccessibility
+        mController.updateImportantForAccessibility();
+
+        // THEN: mNotificationStackScrollLayout should be important for A11y
+        verify(mNotificationStackScrollLayout)
+                .setImportantForAccessibility(View.IMPORTANT_FOR_ACCESSIBILITY_YES);
+    }
+
+    @Test
+    public void updateImportantForAccessibility_hasChild_notOnKeyGuard_importantForA11y() {
+        // GIVEN: Controller is attached, active notifications is not empty,
+        // and mNotificationStackScrollLayout.onKeyguard() is false
+        initController(/* viewIsAttached= */ true);
+        when(mNotificationStackScrollLayout.onKeyguard()).thenReturn(false);
+        mController.getNotifStackController().setNotifStats(
+                new NotifStats(
+                        /* numActiveNotifs = */ 1,
+                        /* hasNonClearableAlertingNotifs = */ false,
+                        /* hasClearableAlertingNotifs = */ false,
+                        /* hasNonClearableSilentNotifs = */ false,
+                        /* hasClearableSilentNotifs = */ false)
+        );
+
+        // WHEN: call updateImportantForAccessibility
+        mController.updateImportantForAccessibility();
+
+        // THEN: mNotificationStackScrollLayout should be important for A11y
+        verify(mNotificationStackScrollLayout)
+                .setImportantForAccessibility(View.IMPORTANT_FOR_ACCESSIBILITY_YES);
+    }
+
+    @Test
+    public void updateImportantForAccessibility_noChild_notOnKeyGuard_importantForA11y() {
+        // GIVEN: Controller is attached, active notifications is empty,
+        // and mNotificationStackScrollLayout.onKeyguard() is false
+        initController(/* viewIsAttached= */ true);
+        when(mNotificationStackScrollLayout.onKeyguard()).thenReturn(false);
+        mController.getNotifStackController().setNotifStats(NotifStats.getEmpty());
+
+        // WHEN: call updateImportantForAccessibility
+        mController.updateImportantForAccessibility();
+
+        // THEN: mNotificationStackScrollLayout should be important for A11y
+        verify(mNotificationStackScrollLayout)
+                .setImportantForAccessibility(View.IMPORTANT_FOR_ACCESSIBILITY_YES);
+    }
+
     private LogMaker logMatcher(int category, int type) {
         return argThat(new LogMatcher(category, type));
     }