Abstract: Filter design is an important part of the digital signal processing course, which has the extremely wide spread application in many areas such as communication, signal and information processing. Based on achievements in scientific research, one designs a synthetic experiment which contains half-band filter, cascade integrator comb filter and analog low-pass filter, given the specific experimental content and the experimental process. To design filter is closely related with the scientific research project requirements. Through the experiment, students can not only master relevant theory and design method of filter, but also cultivate students’ comprehensive practical ability, scientific research ability and team cooperation ability. Practices show that achievement in scientific research applied to the experimental teaching is an important approach to improve the teaching quality.