The subprime mortgage crisis in the United States and the recent excessive prosperity of the domestic real estate market have forced the CBRC to be more alert to the risks of housing mortgage loans. In order to provide early warning and prevent the loss of bank credit assets caused by large fluctuations in real estate prices, the CBRC informed in July that major commercial banks should conduct stress tests on housing mortgage loans. As a risk detection method, stress testing mainly applies the information of comprehensive price changes to the bank's asset portfolio, quantitatively calculates the bank's own potential gains or losses, and thus determines the bank's risk degree. In fact, it is far from enough to do a good job of risk early warning of housing mortgage loan business. Commercial banks need to strengthen risk management and control from two aspects. On the one hand, commercial banks should actively carry out stress tests according to the requirements of regulatory authorities, objectively understand their ability to resist macroeconomic fluctuations by using the results of stress tests, and reflect the results of stress tests in asset structure adjustment and risk management and control. On the other hand, commercial banks should promptly reverse the business philosophy that housing mortgage loans are "high-quality assets" and "the more the better", and pay close attention to the possible adverse effects of changes in the real estate market on bank assets. At the same time, in the external business situation of rising real estate prices, commercial banks should embody the principle of "rather short than long" in housing mortgage loan business, appropriately increase the down payment ratio of housing mortgage loans, increase the examination of the qualifications of lenders, reduce the default rate and default losses, and minimize potential losses.