With the high incidence of cybercrime cases, there is an urgent need for elite talents in digital forensics. The core of forensics talent training is to build a knowledge system. Through a comprehensive analysis of the inspection background, mirror image, topic assessment knowledge of the world's major digital forensics competitions, we summarized the content of the competition knowledge modules; combined with the public security electronic data forensics workflow, proposed a knowledge map of forensics elite talents; finally the train of thought of talents.