GPS meteorology,composed of ground-based and space-borne sounding,has been one of the important GPS applications so far.It is basically mature for ground based applications,and experiencing operational transition.As far as to space-borne GPS meteorology,there have been many launched GPS satellites and missions.In the future,GPS receiver for atmospheric occultation is one of payload for satellite in both NPOES and METOP.GPS meteorology will be part of satellite meteorology.The dataset of pressure,temperature,water vapor and electron content obtained by GPS sounding will be of great value for meteorological forecast,climate and space weather.