Abstract: Fault diagnosis system based on knowledge has been analyzed.To deal with the disadvantages that the fault diagnosis system can not transfer initiatively the knowledge to the decision-maker at opportune moment,a dataflow-driven architecture framework of fault diagnosis system based on knowledge management and knowledge pushing was proposed.Its primary hierarchy,organized and managed mode of knowledge was analyzed,and the dataflow-driven active pushing manner for knowledge was studied.The control mode of knowledge active pushing was founded,and the dataflow-driven integration prototype system based on knowledge management was developed.Finally,taking the fault diagnosis of liquid rocket engine test stand,for example,the fault diagnosis system based on knowledge pushing was conducted,and the latter experiment has shown the effectiveness of the method.