The new requirement of modern war on the range of radio fuze is analyzed. A new high range frequency agile radio fuze scheme is proposed, and the ideals of software radio is also adopted in design, which make fuze possess the ability of software programmable and enhance the ability of anti-jamming. An algorithm of range based on multi-frequency pulse comparing phase is proposed based on multi work-frequency agile, which gains information of range using phase differences between echoes. The simulations verify the feasibility of this kind of high range frequency agile fuze.