Abstract: An effective method for analyzing the electromagnetic scattering from finite microstrip array is proposed.It combines the finite array Green's function with the method of moment,and effectively improves the computation efficiency of the analysis of electromagnetic scattering by a large finite microstrip array.This method can be adapted to microstrip arrays with arbitrarily shaped elements by choosing RWG basis functions.In this paper,radar cross section of arrays with rectangular,cross-shaped and circular element is computed and the results are compared with the that of method of moment to validate this method.