Abstract:This paper systematically reviews and analyzes national space science strategies and plans, as well as the performance layouts of space sciences and technologies of the major countries worldwide since new millennium. The work quantitatively evaluates the scientific outcomes（SCI research papers and proceeding papers）of space science missions based on bibliometrics method, therefore comprehensively depicts the flourishingly developed international space science researches which focused on the fundamental and cutting-edge scientific questions. Despite lack of adequate space science missions or opportunities to acquire more scientific data, China has already built a certain basis for space science research and hence possesses the abilities and potentials to achieve significant breakthrough in this field in the near future. The present work is expected to support the further researches and help formulate programs for the development of space science of China.