With the diversification of system based on DSP,it has become an important problem that system can't work normally due to the failure of DSP program online upgrade and boot.In order to improve the reliability and maintainability of DSP system,a backup boot scheme based on SPI+EMIF NOR FLASH and a single SPI FLASH three-stage loading backup bootload scheme are designed according to the bootload principle of DSP based on M6678 DSP.In the two FLASH backup bootload method,the DSP backup FLASH program can be bootload by switching the DSP BOOTMODE online,then reset DSP.Single-chip SPI FLASH three times loading backup bootload method by placing the UBOOT programs,application programs and backup application programs in the three segments of the SPI FLASH,DSP loads the UBOOT program in the first address of the FLASH through the RBL program,and the UBOOT program loads applications in different FLASH addresses according to external signals.The test results show that both schemes can implement the DSP backup bootload function and improve the reliability of the system.