Abstract: The O-PIRTAS model teaching method has been applied in the reform of the engineering graphics course, based on the Xueyin online platform. Through a combination of blended teaching methods, including pre-class preparation, instructional videos, video reviews, knowledge tests, exploratory activities, and concluding reflections, the teaching reform effectively achieved student-centered instruction. It successfully motivated students’self-directed learning awareness, catered to individualized learning needs, and enhanced students'practical skills and engineering awareness. This approach provides insights for the reform of engineering courses under new circumstances and serves as a reference for fostering innovative talents in higher education.

Key words: O-PIRTAS model, Blended teaching, Engineering graphics, Instructional objectives, Effective teaching, Teaching reform