Abstract: The application circuit can well reflect the core principle of the power electronics technology,namely the intersection of the three branches of“electronics,power and control”.The application circuit teaching provides students with an effective way to fully understand the power electronics technology.This paper takes the active power filter application circuit as an example,uses the power electronic circuit simulation software,,and discusses the teaching design and practice of the power electronics application circuit,using power electronics simulation software.It helps improve the practicability of the power electronics course.