Recently, bull market has caused a large sum of bank deposits to flow to stock market, which makes the banks worried that their funds will be sucked out. ANBOUND research team believes that such a concern reflects the fragility of domestic banks to a certain extent. Chinese banks have relied on the businesses of deposit and interest margin for a long time and find it hard to adapt to the change of financial market structure. Once deposit basis and interest rate are changed, banks are seriously influenced. If stock markets keep absorbing bank deposit, the fragility of Chinese banks will be further revealed.