The paper carries out a systematic survey on the origins, evolution, formation module of 201 radicals of Chinese characters by means of database analysis method. On the basis of the above investigation, the research probes into the relation between 201 radicals and HSK 2905 from the aspects of Ziwei (overlapping percentage), character-formation frequency, positions and functions. With the help of the psychological theory, the methods of learning radicals are provided for reference.