China’s Space Station (CSS) will be established in 2022, making China the third country to be able to build and operate the space station independently. The international cooperation of the CSS has initiated. International cooperation in the CSS operation is an effective way to promote the long-term sustainability of space activities and realize a community with a shared future for humankind. As China has not yet promulgated its national space law, international cooperation in the CSS operation will inevitably encounter legal problems. In the context of the lack of relevant legislative basis and practical operation experience in China, to carry out international cooperation and maintain the long-term sustainable operation of the CSS, it is necessary to learn related legal experiences and make corresponding institutional arrangements.