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The design method of array antenna wideband scattering reduction is researched, a low scattering array antenna based on passive cancellation technology is designed which has the performance of wideband dual polarization low radar cross section (RCS). The RCS performance of the antenna array consist of two kinds of elements with different scattering properties is studied theoretically. The influence of the scattering amplitude and phase of elements on the RCS of array antenna is analyzed. A new microstrip antenna element structure is designed by loading T-slot on the edge of the microstrip antenna radiation patch. By modifying the microstrip antenna element, its radiation performance and scattering performance can be independently regulated and comprehensively optimized. It has similar radiation characteristics with the reference microstrip antenna element and the effective phase difference between the two elements is produced in a wide band (in-band and out-of-band). The traditional microstrip antenna element and the new microstrip element loaded with T-slot are composed of 4×4 array antenna. The simulation results show that, the design array antenna achieves the reduction of co-polarization RCS in the frequency band of 3GHz ~ 7GHz (relative bandwidth 80%) and cross-polarization RCS in the frequency band of 3.3GHz ~ 7GHz (relative bandwidth 71.8%). The peak values of RCS reduction are 16.3dB and 36.3dB, and the mean in-band RCS reduction are 14.1dB and 17.6dB, respectively. Compared with the traditional microstrip array antenna, the gain loss of the proposed array antenna is less than 0.1 dB. Therefore, the proposed microstrip array antenna has high radiation efficiency and wideband dual polarization low scattering performance and a new idea for the design of low RCS antenna array is presented.