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The development history and present state of spacebased GPS occultation, as well as the advancements of spacebased occultation sounding and the brief merits and demerits of different occultation inversion methods, are introduced. The emphasis is put on the latest researches and advancements of GPS occultation sounding in China. A detailed introduction is made to the research achievements of mountainbased GPS occultation sounding. The prospects of the research emphases and development tendency of GPS occultation sounding in China are discussed. It is pointed out that GPS occultation sounding will develop towards the constellation and comprehensive application, and China will certainly rank among GPS occultation sounding developers.