A-shares have been reformed and found this problem, because the delisting mechanism of A-shares was not perfect and there was no good short-selling mechanism. Now there are stock index futures, margin financing and securities lending, and delisting are also improved step by step. Listing of new shares will be normalized again. Under this mechanism, the slowly good stocks will weigh more and more on the index, and the junk stocks will weigh less and less on the index, thus a slow bull market will appear. In the process of this change, the trend will be slow.