Abstract: A novel path choice RF MEMS SP2T switch based on single actuation voltage is presented. Switch’s performance is simulated and optimized by using Ansoft HFSS and ANSYS software. As software shows, the actuation voltage is V, the switching time is us, and the central frequency is 30GHz. When switchs are in up state, its insert loss is 0.42dB, return loss is 43dB, the isolation is 29dB; while in the down state, insert loss is 0.53dB, return loss is 19dB, and the isolation is 28dB, the performancssimulation and optimization design is perfectly achieved.