When the general capacitance touch chip is used in the environment with large temperature difference range and complex electromagnetic environment, there will be the problem of false alarm point, and the number of pins is fixed and the flexibility is poor. Field programmable gate array (FPGA) is adopted as a controller, cooperating with the peripheral excitation and acquisition circuit, and combing the FPGA processing algorithm to realize the control design of the projection mutual capacitance touch screen. Through testing and verification, all indexes meet application requirements.