Adopting task-based online and offline teaching mode, taking the expression of a mechanical part as the work project of the whole course, and taking the specific expression needs as the learning tasks, the basic knowledge and basic skills of design and drawing, the expression of geometric elements and basic bodies, the expression of combinations, the expression of the shape of complex machine parts, the expression of transmission and connection parts, the expression of general parts, the expression of mechanical equipment, and other 8 modules. Each module contains teaching links such as mind map, task release, video explanation, seminar and Q&A, evaluation, etc., which are specifically refined into knowledge module, skill module and thematic training module.