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In tradition, CPU and memory chips with high quality grade is used for on-board computer, in order to obtain higer reliability of the system. Due to the limitations in the manufacturing cost and production cycle, more and more commercial-off-the-shelf(COTS) components are used in the on-board computers of commercial satellites. Of course, more COTS components could make the system lower reliability and worse security. By making use of the industrial-grade processorSchip named SmartFusion2, a minimum system structure of low-cost on-board computer is proposed, and it can extremely improve system reliability by the use of Heterogeneous redundancy for the industrial-grade memory chips. For the software design of the on-board computer, although the triple module redundancy is applied by the application software to obtain higher reliability and better security, the boot-loading software is single. To avoid the single point of failure in the boot-loading software, a off-chip boot-loading method base on multi-TMR copies for the on-board computer using SmartFusion2 processor, which improves the reliability and security of the on-board computer with industrial-grade. In addition, the boot-loading method has been used in some commercial satellites successfully.