Abstract: To help students master the method to test amplitude-frequency characteristics and design basic band-pass filters, this paper took the design of double Sallen-Key series broadband pass filter circuit as an example to help them gain a better understanding and master the design method of filters and deepen their understanding of the connection among high-pass, low-pass and band-pass filters. From simplicity to complexity and from theory to practice, the experimental teaching was closely integrated with engineering technology to transform knowledge transmission through abstract simulation technology into gradually profound experiment content. It has been proved that the “software simulation + hardware debugging” experiment method can enhance students’ understanding of the basic design method of active filter and the connection between amplitude-frequency characteristics and filter performance. Meanwhile, it can effectively hone students’ ability to discover and solve problems.