关键词: 乘法结构, 量度结构

Abstract: This article makes attempts to study the law in the establishment of school children s isomorphic concept. The studies show that there are a major factors which influence the establishment of school children s isomorphic concept: 1. the limitation of children s thought;2. the overemphasis of the effect of three figure relation in math teaching. It is suggested that school children enter the stage of formal operations as early as possible

Key words: multiplicationstructure, isomorphismofmeasurement