In order to carry out a more in-depth study on the load sharing characteristics of the torque-split gear system, a nonlinear dynamic model was established. The numerical simulation method was used to calculate the load sharing coefficient of the system. The influences of the torsional stiffness of the linkage shaft, the output shaft support stiffness, the input speed and the axial angle on the load sharing coefficient were studied. Experiment of gear system was carried out, and the research results show that:the load sharing coefficient of the output end is larger than the one of the input end, and the load sharing coefficient of the high pressure input end is larger than the one of the low pressure input end; the load sharing coefficient grows with the increase of the torsional stiffness of the linkage axis; with the increase of the support stiffness, the load sharing coefficient increases first and then reduces; the load sharing coefficient shows fluctuations with the growth of input speed, and the resonance peak appears in the range from 4 100 r/min to 4 400 r/min; the value of shaft position angle a₂ can affect the change law of the load sharing coefficient with a₁, and minimizing the shaft position angle can improve the load sharing performance of the system. Experimental results verify the correctness of the model of marine gear system.