Composites with high specific strength have limited ability to redistribute loads， making the connection structures design a key challenge in structural design. This paper proposes a design scheme for composite-metal multi-bolt joint structure which can withstand extremely high static loads， based on practical requirements and the calculation method of load coordination and balance theory. The design scheme is verified by using ABAQUS software， and the impact of potential dimensional tolerances on the nail load distribution is analyzed. The study finds that machining stepped holes in the connecting structure to reserve deformation space for the bolts can effectively improve the stiffness matching between the metal and composite structures. Additionally， applying preload force can significantly enhance the maximum bearing capacity of the connection structure. The stepped-hole design proposed in this paper reduces the maximum fastener bearing ratio from 36.06% to 18.14% for the six-row bolted connection structure， and increases the bearing capacity by 19.62% compared with traditional connection designs. The proposed design does not require high processing accuracy and effectively controls the fastener-bearing ratio throughout the entire loading process. The research findings provide valuable insights for designing connection structures with high load-bearing requirements.