Abstract: Taking the auditing course as research object, this paper explores the reform plan of its blended teaching mode and constructs a blended teaching system. Before class, theoretical videos, cases and tests are pushed through micro-classes, etc. to stimulate self-study interest; in class, case-based group discussions, simulated audits and special lectures are carried out to cultivate practical and innovative abilities; after class, online exploration tasks and offline enterprise visits are set up to deepen knowledge application. At the same time, course-based ideological and political education is integrated, and professional ethics are cultivated through typical cases. A student evaluation and teacher assessment system covering multiple dimensions of online and offline is also constructed. The research shows that this mode can enhance students' participation and comprehensive abilities.