“乘法分配律”一直是教学的重点和难点。如何有效地予以突破,从而使学生能够准确把握该定律的内涵,进而达到切实掌握并能灵活地加以运用的目的,本文尝试以建构主义教学观为指导,从学生已有知识经验出发,进行意义的深层建构。 “Multiplication Distribution Law ” has always been the teaching of the key and difficult. How to effectively break through, so that students can accurately grasp the connotation of the law, so as to achieve the purpose of practical grasp and flexibility to use. This article attempts to constructivism teaching as a guide, starting from the student's existing knowledge and significance Deep construction.