Abstract: In this paper, the design on 2-Way power combined for 170 GHz doubler is studied and realized. The E-plane Y-type power divider/power adapter is designed and realized by using 3D electromagnetic simulator. The power divider adopts WR10 standard waveguide, with an insertion loss of about 0.2 dB in the 80 GHz~95 GHz frequency band, and an isolation of about 6 dB between ports 2 and 3. The output power combiner adopts WR5 standard waveguide, with an insertion loss of about 0.4 dB in the 160 GHz~185 GHz frequency band, and an isolation of about 6 dB between ports 2 and 3. In order to meet the consistency requirements, the 170 GHz doubler was designed and manufactured using GaAs monolithic microwave integrated circuit process. The test results show that when the input power is between 600 mW~800 mW, the output power of 163 GHz~178 GHz is between 110 mW~264 mW, and the power-combined efficiency is over 80%. At the frequency of 171 GHz, the peak output power can reach 264 mW and the peak power-combined efficiency can reach 92%.