A finite element model of drive system of a high-voltage circuit breaker is built by means of a parameterization program. The model is simplified to reduce calculation time. The deformation and von-Mises stress of the key parts in the drive system are calculated based on explicit finite element method. The measured displacement curve of the drive system is taken as displacement load to be input to the model. As the time interval in the explicit finite element analysis is small

the pulsation in the measured displacement curve will lead to unstable computation

so the measured displacement curve is smoothed by fitting. The friction between the moving and stationary contacts is also considered. The analysis results of the deformation and von-Mises stress of the key parts in the drive system may provide a basis for optimization design of the drive system.