With the banking industry stepping into the new stage of dual constraints of capital and liquidity,the synergy effect will lead to adjustment of micro-management characteristics of banks,and it may bring about changes of monetary policy effect through bank transmission channel. Based on the data of 50 commercial banks in China from 2010 to 2015,One-Step System GMM method is used to test the changes of the risk-taking channel of monetary policy under the double constraints,so as to explore the influence of t...