Abstract: More and more distant from the radar range, high power density is more and more restricted to radar antenna element spacing, particularly is high frequency radar antenna power system engineering implementation is very difficult, and as an important unit of radar antenna power, the role of the front power supply system is very outstanding, the traditional power system architecture have been unable to meet the demand of development of the radar antenna. In this paper expounds the necessity of pulse peak power supply architecture for high frequency radar front, and indicates that high power density pulse power supply is the key technology of pulse peak power supply architecture for radar front. The design methods of main power circuit ,loop regulation and compensation circuit, magnetic combination and heat dissipation of power devices of pulse supply are introduced comprehensively. Finally, the correctness of the design is verified by a prototype of high power density power supply with peak power of 5 kW.