Integrated navigation device needs enough non-volatile memory storage capacity, and this paper designs a storage system based on domestic DSP and Micro SD card. Firstly, this paper introduces general design about the storage system of integrated navigation device. Secondly, based on domestic DSP and Micro SD card, this paper designs the storage system hardware using SPI communication protocol mode. Thirdly, based on storage system hardware, this paper designs software and realizes reading and writing data in the Micro SD card. The practical application results show that the storage system in this paper has the advantages of large capacity, small size, easy transplant and upgrade, and has a high application value.