The magnesite deposit in China are abundant reserves which occupy the first place in the world. Sparry magnesite is the main type of magnesite deposite that is easy to exploit，which is mainly dominated by Sedimentary-Metamorphic type concentrating in eastern-Liaoning province，to have formed a world-class large-super large magnesite ore-concentrated area and production base. Moreover，hydrothermal metasomatic deposit associated with ultramafic complexes and eluvial deposit produced by weathering are also two important kinds in China and Western Section of Bangonghu-Nujiang Metallogenic Belt can be taken as an important target region to prospect lake-sedimentary magnesite deposit. Based on a systematic collection of materials from sixty two places of magnesite production in China，the author summarizes the metallogeny of magnesite，further delineates thirteen magnesite metallogenic belts，delineates the “Maps of Metallogenic Regularities of the Magnesite Deposits”、“Maps of Metallogenic System of the Magnesite Deposits”and“maps of Distribute of Metallogenic Belts of Chinese Magnesite Deposits”etc，and provides a theoretical basis for forecast of potential assessment of magnesite resources in China. Furthermore，this article explores some key scientific issues including the formation of ultra magnesite ore-concentrated area，and source of magnesium.