By establishing the dynamic model and adopting the finite element method, the special bolt’s stress distribution and the contact areas between different components of the system are obtained. According to the analysis result, the bolt’s strength meets the operating requirement, bolt pretightening force has a great influence to the bolt strength, and gravity loads of cylinder cannot produce considerable changes of bolts, however, the phenomenon of deviation load is serious. The bolts experiment based on group of bolts is conducted to show degree of deformation. The experiment results are agreed well with the analysis results.