摘要：In order to improve the safety of the battery of satellite side mounting,and prevent the screw from producing excess due to frequent assembly and disassembly,the YS-20 material replacement and structure optimization design of the screw body are carried out under the premise of not changing the original *** double⁃shear test of YS-20 bar is carried out,and the ANSYS optimization design module is used to design 7×7×6,a total of 294,calculation cases of D1,D2,T,the three important dimension parameters of screw *** actual bearing state of screw composite structure is accurately simulated by using asymmetric contact *** comprehensive evaluations are established,and the calculation examples satisfying the conditions are evaluated *** final results are T=12.2 mm,D1=16 mm,D2=2 *** stress verification and contact analysis are carried out for the final scheme and the bearing state and contact state optimized screw structure are obtained.