diff --git a/store/tikv/region_cache.go b/store/tikv/region_cache.go
index 24f1ff1e32fd3..1403373fe91cb 100644
--- a/store/tikv/region_cache.go
+++ b/store/tikv/region_cache.go
@@ -677,6 +677,9 @@ func (c *RegionCache) UpdateLeader(regionID RegionVerID, leaderStoreID uint64, c
 func (c *RegionCache) insertRegionToCache(cachedRegion *Region) {
 	old := c.mu.sorted.ReplaceOrInsert(newBtreeItem(cachedRegion))
 	if old != nil {
+		// Don't refresh TiFlash work idx for region. Otherwise, it will always goto a invalid store which
+		// is under transferring regions.
+		cachedRegion.getStore().workTiFlashIdx = old.(*btreeItem).cachedRegion.getStore().workTiFlashIdx
 		delete(c.mu.regions, old.(*btreeItem).cachedRegion.VerID())
 	}
 	c.mu.regions[cachedRegion.VerID()] = cachedRegion