Abstract: According to the design of mooring system, we carried out the stress analysis of anchor chain, steel bucket, steel pipe and buoy under different sea conditions.The classical mechanicsand the MATLAB were used to establish the Mechanical Model of Mooring system and the quality iteration of the heavy ball. We got the final results of the inclination angle of the bucket and the steel pipe ,the draftof the buoy, the swimming area, the shape of the anchor chain and the weight ball quality and other results under different sea conditions.