Abstract: Aiming at problems including the disconnection between theory and practice and students'insufficient spatial thinking ability in the descriptive geometry and mechanical drawing course, this study constructed a“three-phase, four-dimension, dual-line integration”blended teaching model based on OBE concept and AI technology. Using the three phases of“pre-class exploration, in-class internalization, and post-class transfer”as the main line, the model systematically designs teaching through four dimensions: objectives, process, evaluation, and environment, achieving deep integration of professional knowledge and comprehensive literacy. Modular and tagged digital resources were developed on the Superstar platform to implement data-driven precision teaching and intelligent evaluation. Two rounds of teaching practice demonstrate that this model effectively enhances students'engineering graphics literacy, standardization awareness, and innovative practical ability, while improving learning initiative and teaching effectiveness, providing a referential path for reforming engineering graphics courses.

Key words: Descriptive geometry and mechanical drawing, Blended teaching, Teaching model innovation, Engineering graphics literacy, Personalized intervention, AI empowerment