To　avoid　various　sudden　accidents　and　diagnose　various　faults　timely　and　accurately　during　pump　operation,　an　on-line　condition　monitoring　and　fault　diagnosis　system　for　pump　is　established　based　on　CAN　bus　and　fuzzy　theory　in　the　paper.　In　this　system,　warning　function　of　comparatively　threshold　value　is　added　using　dynamic　data　exchange　technology　between　configuration　and　Visual　Basic　(VB)　application　program.　At　the　same　time,　a　fault　diagnosis　expert　system　is　established　using　mixed　programming　technique　based　on　COM　component　between　VB　and　MATLAB　according　to　the　fuzzy　relationship　between　faults　and　symptoms　during　pump　operation.　Result　of　the　system　running　shows　that　the　system　can　real-time　alarm　when　the　operation　conditions　of　pumps　are　abnormal.　The　system　has　good　reliable　performance,　and　it　significantly　enhances　the　level　of　safety　management　for　pumps.