Abstract: The low-frequency pulsed magnetic field is a common source of electromagnetic interference, which can be generated in various activities, such as lightning discharge, ground nuclear explosion and production and life. It has multiple characteristics, such as low frequency, low resistance and time variation, so it can be applied to computer systems through direct penetration and magnetoelectric induction, and creates interference or damage. In order to determine the effect law of low-frequency pulsed magnetic field on computer system, the effect experiment of low-frequency pulsed magnetic field on the Lenovo brand computers (2 desktop models and 1 notebook model) were carried with solenoid pulsed magnetic field simulation device, among which, the pulsed magnetic field rise time is between several and hundreds of microseconds, and the maximum magnetic induction intensity is about 70 mT. Through the work, the disturbance threshold and effect law are obtained, the relationship between effect phenomenon and characteristic parameters of magnetic field is analyzed, and the results are in accordance with the theoretical expectation and the logical relationship of the existing results. It can provide reference and basis for the protection of low-frequency pulsed magnetic field in computer systems and similar equipments.