Considering the coupling excitation of nonlinear unsteady oil film force, rub-impact forces and mass unbalance, the shafting nonlinear dynamic equations with angular misalignment is firstly proposed. And through numerical simulation, the effect of angular misalignment level on the system vibration characteristics is also studied. Moreover, the technology control standard for misalignment angle value based on the calculation results is developed. Simulation results show that under the unsteady oil film forces excitation, shafting dynamic equations are complicated, and it is difficult to solve them. This leads to the complex dynamic behavior of the system, and makes it difficult to effectively control shafting nonlinear vibration by theoretical analysis. It can avoid theoretical research problems through the developed control process and achieve the purpose of controlling the nonlinear vibration level.