The RVDT(Rotary Variable Differential Transformer) sensor is actually a kind of differential Transformer.It is used to transfer the mechanical displacement signal to the electrical signal. It has the feature of high sensitivity、good linearity、high resolution、long life and high reliability,so it is widely used in the field of avionics. The RVDT sensor outputs the differential signal, so traditional instruments can't simulate the RVDT sensor's signal,so the simulator of the RVDT sensor plays an important role in researching and testing the function of the flight control system instead of the real RVDT sensor.