Abstract: Electromagnetic scattering from group target with large size has attracted much attention for years. Group target has the properties of large number of objects, large number of unknowns and complex coupling. CRWG basis is used to discretize the induced current for each object with phase extraction. The group target is divided into several groups, and method of moments is used to solve the current of each group and the coupling between the groups. Numerical results show the efficiency and accuracy of this method. CPU time and memory requirement are saved. This algorithm is efficient for analyzing the scattering and radiation of the group target.