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The model that using a large number of aerospace grade components has the limitations of high cost, long development cycle and low performance, which is difficult to meet micro/nano satellites’ short cycle, low cost and high integration requirements. Therefore, a method using COTS components in satellites is proposed. According to the characteristics of micro/nano satellite, requirements and risks of micro/nano satellites with COTS components were analyzed; then, selection principle and basis for micro/nano satellites using COTS components were presented. On this basis, through the analyses, application process and COTS component level and board level screening method were proposed. The hardening design protection from single event effects was studied to improve the reliability of COTS components application. In orbit results validate the effectiveness of COTS components screening method. After being hardened, the COTS components can meet the requirement of being stably operational in orbit, and help shorten the development cycle and cost of satellites. This method provides general guidance for COTS components application in micro/nano satellites.