Mathematics teaching often pays more attention to imparting knowledge than students' emotional experience, and pays more attention to the examination of academic performance than the teaching of simple formative process evaluation, which will not only reduce students' interest in learning, but also bring great limitations to their socialization. Therefore, based on the law of students' development, we should explore the teaching mode of "learning first, teaching later and reaching the standard in class", so as to effectively promote the all-round development of students' subjective spirit, practical ability and various qualities.