A simplified spring–mass model was proposed to deal with the pin load distribution of bolted joints for one aircraft. The feasibility of simplified model was proven by a case of low pre-tightening force bolted joints. The reasons for huge error in the application of simplified model in high-torqued joint were analyzed. To solve the problem

a reduction coefficient of theoretical friction force and correction factors of pin load distribution based on similarity principle were used to modify the model. Results show that the modified model can greatly enhance the accuracy of predicting the pin load distribution of the reached structure with different applied loads and pre-tightening forces. This method provides a good reference for the simplified calculation of high pre-tightening force multiple-bolted joints.