The failure distribution from traditional reliability methods reflects the “average” characteristics of the same kind of product. In order to get the real time reliability of degradation failure product with history test data, this paper adopts the local updating ideas, uses the on-site measuring data through Bayes method and gets the real time reliability model of the product that timely reflects the on-site data. The result shows that real-time reliability model expresses the specific characters gradually with the increase of fusing on-site data.