Abstract: Combined with the infrared spectroscopy experimental teaching of undergraduates,based on the teaching target classification method,an experimental teaching method was carried out to improve the traditional experimental teaching methods.This new experimental teaching system is clearer,easier to be evaluated and it takes into account the three-dimensional development of value,ability and knowledge.Practice has proved that improved teaching method can obtain better teaching effects in practice.It is a good opportunity for students to promote their comprehensive practical ability and ability to analyze and solve problems,and it can also provide some credible references for relevant experimental teaching of undergraduates.