The impact produced in the process of crane slewing is easy to shorten the service life of equipment and reduce the stability of crane slewing. To solve this problem, the crane slewing system was modeled, and a method of pressure shock inhibition was proposed. According to the working principle and process of a crane slewing system, a crane slewing system model was established by using AMESim. The accuracy of the model was verified by comparing the experiment with the simulation. The pressure shock inhibition method was proposed, and it was verified by the built AMESim model. The experiment was carried out on a crane truck. The experimental results show that: the proposed pressure shock inhibition method can reduce the maximum motor inlet pressure by 25 MPa, which suppresses the pressure shock of the crane during the rotary operation to a certain extent, and improves the rotary stability of the crane.