In order to ensure the domestic reliable replacement of high-purity alumina substrates for satellite microwave circuits， the requirements for process suitability verification of high-purity alumina substrates for spaceborne products are analyzed comprehensively， research has established a process suitability verification index system for high-purity alumina substrates used in spaceborne microwave circuits， verification test project is comfirmed， experimetal verification methods such as microwave circuit process component test and component product environmental adaptability assessment are utilized， the process suitability verification method of ceramic substrate materials is demonstrated. The study shows the verification project is identified based on verification requirement analysis， all kinds of verification data are obtained through experiment and process practice for multidimensional comprehensive evaluation， the objective， complete， scientific and effective process suitability verification conclusion is given.