Abstract: An approach of building the SOC platform based on the LEON open microprocessor IP core is proposed and complemented by re-configuration of the core.The SPI is added to the platform to expand the function.Matching between VHDL and Verilog type is completed, and by writing wrapper, the type of SPI interface is successfully transformed into the standard type that defined in AMBA APB.The feasibility of the design is proved through the FPGA verification and GRMON scan, and the features expected are achieved completely.