Abstract: In response to the situation that students cannot return to school during the epidemic, in order to implement the requirements of the Ministry of Education and the school to “suspend classes without stopping teaching and studying”, the Mechanical Drawing course carried out online flipped classroom teaching practice. This article attempts the online flipped classroom teaching model from several aspects, such as preparation work before the start of class, reconstruction of effective course objectives, construction of abundant teaching resources, online teaching implementation process, teaching evaluation and assessment. Through teaching practice and questionnaire survey analysis, the online flipped classroom teaching model has cultivated students' autonomous learning ability, greatly mobilized students' enthusiasm, and improved the teaching effects.

Key words: Online flipped classroom, "Mechanical drawing", Self-learning, Diversified assessment