Abstract: In order to realize low-cost and high-efficient application of COTS components in spacecraft, this paper reviewed the industrial basis and application risks of commercial plastic encapsulation components, and application strategies of COTS components by aerospace agencies at home and abroad. For the selection strategy of COTS components, a systematic selection procedure combined requirement analysis, selection, supply and application of components was proposed. On this basis, the selection elements of component supplier selection, implementation standard selection and product selection were designed. Finally, according to the practical requirements of component application, suggestions for the selection and control of COTS components for spacecraft were given.