Vibration test is the important measure to improve the design and the capability of a plane, but the problem of the clipped data often can be found. This paper use the information provided by the right data to restore the clipped data.This dissertation researches in the vibrant clipped data of a plane, proposes regression analysis, BP learning algorithm and cubic spline interpolation to forecast the clipped data. Firstly, the paper studies the arithmetic and theories about these three methods, compiles the ...