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According to the current situation that "more contents and less time" in metalworking internship teaching, combined with the actual of metalworking internship teaching reform, based on the features of " micro" era, the paper researches the key of micro-class production from selection of knowledge, proposition, teaching design, material collection, making, editing and recording. It proposes a supplementary teaching method that makes micro-classes for the key points in metalworking theoretical and practical teaching. The micro-classes make the esoteric theory simple, simple questions interesting. It can improve the students learning enthusiasm, and provide reference for the teaching reform, and improve teaching quality in metalworking internship. [ABSTRACT FROM AUTHOR]