Based on the summarization of failure cases and experience of 0Cr18Ni10Ti pipe,the features of corrosion failure information to be considered are generated.Uncertainty knowledge presentation methods which combines production and frame are devised,and the method for acquiring weights of features in corrosion failure rules is presented.The uncertainty reasoning method of weighted of failure rules is presented,and an example of calculation in diagnosis reasoning is illuminated.The research is the foundation of intelligent diagnosis of corrosion failure mode.