Abstract: Function Point Analysis is a widely used estimation method for measuring software size. In order to solve the problem of uncontinuity caused by complexity grade division with IFPUG(International Function Point User Group)Function Point Analysis, combined with fuzzy theory and interpolation methods, this paper presented the fuzzy-interpolation function point analysis. It is proved that the new method can more accurately estimate the number of functionpoints, and also has excellent performance on practical operability.

Key words: Function point analysis, Fuzzy, Interpolation, Complexity grade