The establishment of satellite earth observation system is an important means for effective management and application of satellite information resources. From significant demands for earth observation in China as well as cutting-edge scientific issues, we propose some key technologies of developing earth observation satellite data integration system under big data environment, including semantic integration of large heterogeneous earth observation data, fast data processing of satellite remote sensing imagery based on grid, in-depth analysis and knowledge discovery of big satellite data, and collaboration processing of multiple data centers and cloud-platform.It is hoped to provide with new technologies and methods for satellite big data management, analysis and archiving.