Designing mitigation mechanism is the core issue to solve the procyclicality problem.In this paper, the authors point out the lacks of Michael B.Cordy' and Rafael Repullo's design on mitigation mechanism.And then,the authors substantially improve their mitigation mechanism and proposed a new mitigation mechanism. The paper also deeply discuss the choosing of smoothing parameter for H-P filter and add a correlation coefficient as one indicator for mitigation effects judgment Finally,the authors use China's e...