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As a national strategic space infrastructure, BDS (BeiDou Navigation Satellite System) can provide civil standard positioning service and military precise positioning service. It is significant to the national defense and economic construction of our country. For studying the mechanism of BDS signal and the technology of navigation service, this paper introduced the basal theory of pseudo-random code and the generation method of BDS’ CB1I code andCB2I code generation method. Then it accomplished hardware simulation experiment of the code based on FPGA. Defined the 11 register in order to describe the state of 11 levels shift register, on this basis, generated the m sequence, and finally generated the CB1I code andCB2I code. Accomplished simulation experiment by Modelsim software, accomplished hardware implementation experiment by downloading to the FPGA. That verifies the circuit is feasible to generate the CB1I code andCB2I code. This paper designed the circuit of evolution based Nios II and VRC array to realize target circuit. This study of the code generation circuit based on programmable logic devices will contribute to the research on anti-interference ability and self-repairing ability of BDS’ code generation circuit in space.