Abstract: The space environment is an extremely complex one.The materials being applied in this environment are inevitably influenced by multiple factors simultaneously, the mechanical and physical chemical properties change,and some functions may lose.To know and evaluate the properties of materials in the space environment, we must adopt effective characterization and research methods.The scope of this presentation includes the basic characteristics,measurement methods and instruments for characterization of materials aging properties in the space environment,the domestic and foreign research status and existing problems of flexible materials aging properties under thermal,photo,vacuum,atomic and compound environments.Meanwhile,the main existing problems in characterization in the space environment are discussed.The study provides some guidance for evaluating the materials properties in space environment.