For successful application of COTS (Commercial off-the-shelf) components in high reliable space systems

the history of COTS used in space systems was inducted and the general route was investigated.Traits of the route were COTS’reliability screening and COTS’reliability evaluation test ahead of the screening

and the relationship between reliability technologies and mission profile.A formulate of burn-in temperature and time adapted to different reliability requirements was researched according to NASA’s rules.Regression models adapted to different missions were investigated and verified.Cases indicated that the method of thermal reliability evaluation test is useful in engineering and the total-ionizing-dose reliability screening model’s relative error is 1%.The systemic method of COTS applied in space items is significant and certificated by engineering practices.