There has been such a remarkable archives development on the Mainland China for thepast forty-odd years to the effect that proper collections, maintenance and systematic handling of the archives of the various historical periods handed down from the past records havebeen fruitfully made with much concern and progress. The archives of the periods from 1912to 1949 especially have had close relationship with the compilation of the history of China. This article aims to make a brief introduction of the establishment of the administrativedepartment in charge of the archives and the archives library network, the development ofthe archives training education, and the promulgation and implementation of the "ArchivesLaw" that have been accomplished by the Mainland China since its founding in 1949.