The system error model is established by taking the single degree of freedom wire counterweight system as the research object. In order to evaluate the influences of various types of geometric errors and inertial forces on the compensation accuracy, the deviation of the lifting point and suspension point is taken as the error evaluation index, and the error evaluation index corresponding to the synchronization error is selected for error matching, which can analyze the influences of various types of errors. It is found that the length of the hanging wire is positively correlated with the compensation accuracy, and there are differences in the influence of various types of geometric errors on the evaluation index. The error caused by inertia force can be equated by solving the suspension chain line problem, and it is found that the inertia force causes the deflection of the lifting point direction as the biggest influencing factor. The calculation example shows that the system has higher requirements on the length of the hanging wire when the angular acceleration is too large.