In order to improve the load-bearing capacity of the composite double-bolt hybrid bolted/bonded joints， model was built on ABAQUS and the feasibility was verified based on experiments and finite element methods. Then， the accuracy of proxy model was studied， and a multi-parameter optimization design was carried out on the plate width， end distance and hole distance of hybrid joints based on genetic algorithm. The results show that the quadratic polynomial surrogate model has the highest accuracy. Compared with the load performance of the conventional double-bolt hybrid bolted/bonded joints obtained in the test， the load-bearing capacity of the structure after parameter optimization has been increased by 44.35%.