Bank runs are one of the challenges faced by the banking industry. Poor management or insufficient liquidity, or even rumors about the bank may lead to bank runs. Similarly, in 2007, the neglect of northern Rock's asset and liability management led to a serious bank run, leading to the nationalization and even bankruptcy of the bank. Taking history as a mirror, this paper takes Northern Rock as an example. The D‐D model is used to study the mechanism of bank runs, explain the necessity of innovation of deposit insurance system, crisis communication strategy and financial supervision system of banks, and analyze the disposal measures and prevention system to deal with bank runs, so as to realize the steady development of bank operations and maintain the good reputation of banks.