The seismo-ionospheric monitoring technologies and their application research development

China Seismo-Electromagnetic Satellite (CSES) will be launched in 2017, which will fill in the gap in the stereo seismo-ionospheric monitoring system, and provide the scientific support for integrated space-ground comparison and validation in seismo-electromagnetic field, and for further understanding geosphere coupling mechanism. In order to meet the development requirements in stereo seismo-ionospheric monitoring system and fully understand each tool, this paper introduces the major ground-based and space-borne ionospheric monitoring technologies in China, including vertical/slant ionosounding, VLF (very low frequency) electromagnetic wave observation, Shumann resonance detection, GPS TEC (total electron content), and space electromagnetic satellite. Meanwhile, the application achievements in earthquake research are summarized, especially the developing status in China. Finally based on the integration of advantages for each technology, the basic framework of stereo electromagnetic monitoring system is discussed, and future comprehensive research fields are also suggested based on multi-source observation data from this system.