Abstract: The principle of magnetic mass spectrometer is briefly introduced. According to types of equipment included in the magnetic mass spectrometer, a two-layer structure of control system based on Ethernet is designed. The basic functions of remote adjustment and monitor of parameters and interlock protection are realized. A set of trigger system is designed for a continuously adjustable delay time of 0~20 μs.Through the test, the system has obtained the spectral graph which satisfies the physical experiment requirements. After dozens of hours of experimental test, the system is stable and operable, which satisfactorily meets the user's experimental needs.