Abstract: The design of unequal Wilkinson power divider which is based on DGS is proposed in this paper. 1：5 powerdividing ratio is realized in the range of 1GHz-2GHz. As the process technology limits the maximum characteristicimpedance of the microstrip line can be 120Ω-130Ω. The DGS on the ground plane provides an additional effectivecapacitive and effective inductive components to the microstrip line. This enables the microstrip line to be realized with veryhigh impedance of over 180Ω.The dividers with DGS and without DGS are both made simulation by HFSS,having achievedthe power dividing ratio to be 1:5.