Cross Model - Cross Mode (CMCM) is a new method of updating parameters, which doesn’t depend on the result of sensitivity analysis and needs no iterative. But this method can’t finish the updating when the Finite Element Method (FEM) has a global error. Aiming at this problem, this paper proposed an Improved CMCM method (ICMCM) based on CMCM. The numerical test of a beam was used to compare the correction of CMCM, ICMCM and commercial software FEMtools. Result indicates that ICMCM can update parameters best both in local error and global error condition.