Abstract: A reconfigurable design method of array antenna pattern under multiple constraints is presented. Under the constraints of array excitation power type and phase weighting only, the optimized array antenna pattern satisfies the preset target. Firstly, the multi-objective optimization model is established, and then different optimization methods are used to solve different problems. The optimized array uses three different power components, and reconfigurable design of pencil-shaped low sidelobe beam, 45 degree cosecant square and 22 degree sector pattern with different phase distribution under the same power excitation is realized . The total input power of the optimized array increases by about 13% compared with the Taylor-weighted total power at the same sidelobe level.