Many of the concepts have similar properties, higher mathematics teaching these concepts, teachers can let students have learned the concept of property, and the creation of analog found situations, and guide students to discover, try to define new concepts. For example, in the number of guide teaches a multi-function two yuan function z = f (x, y) guide number as an example, we can contact and functions of one variable derivative up, in the lecture can be the first review about functions of one variable demand guide, in seeking binary function of the derivative of time, which one independent variable as a constant, another argument derivation process is similar to the functions of one variable so that new concepts can be assimilated easily in the existing cognitive structure and construction, so that students' thinking into the knowledge and the track at the same time lay the foundation for the understanding of the concept and further research.