Abstract: The paper analyses the structure and operating principles of IHI swing-flying shearing，then establishes the kinematics model for shearing framework,and compiles analysis program with powerful MatLab language in mathematic and graphics.Movement track curves for edge of shearing-knife are obtained in different eccentricity and different times.This paper also explores the noise influence in shearing work of different eccentricity and times from quick return characteristics of trajectory.

Key words: swing-flying shear, eccentricity, times the shear coefficient；noise at Work