In　order　to　address　the　problems　of　the　conventional　Wavelet　Neural　Network　(WNN)　in　analog　circuit　fault　diagnosis,　a　new　method　of　analog　circuit　fault　diagnosis,　based　on　Wavelet　Neural　Network　and　particle　swarm　optimization　(PSO-WNN),　is　proposed　in　this　paper.　A　practical　inspecting　of　a　filter　circuit　has　been　implemented,　using　both　the　new　and　the　conventional　method.　The　experimental　results　indicate　that　the　new　method　possess　higher　precision　than　WNN.