The effectiveness evaluation index system on the basis of system analysis of the elements which influences the effectiveness of Equipment Maintenance Support System is put forward. Using the theory and method of artificial neural network and BP network, establishes the model of effectiveness of Equipment Maintenance Support System based on BP neural networks is established. Furthermore, the method of constructing training samples by using the theory of Delphi and Fuzzy Analytic Hierarchy Process is introduced. Finally, the model is confirmed through an example. The results show that the model can greatly surmount the influence of artificial factors and fuzzy randomness, make the evaluating results more reasonable and creditable.