Abstract: For the method of suppressing surge impact in digital power through the front-end surge protection module, when the surge energy is too high, there is the problem that the surge protection module usually unable effectively suppress all surge energy. Aim at this problem, the causes and characteristics of surge are analyzed, the transmission path and waveform at different observation points of surge in digital power are studied, and then some new methods of digital power surge suppression such as printed circuit board(PCB) layout optimization, circuit optimization and magnetic shielding are proposed. The new method is simple in principle and high in reliability, it can make the digital power obtain good surge suppression ability. A 1.2 kW experimental prototype is developed and surge tested, the experimental results show that the proposed new surge suppression method can resist level 4 surge test, and it can guarantee the digital power regular work.