An oil film thickness control system is developed on Siemens computer numberical control (CNC) system, and control model is validated on the test platform. According to the measurement data, the film thickness could be seen almost maintained at the designed film thickness, which affirmed the correctness and feasibility of the control model. Based on results of this study, the issue that the oil film thickness presented to vary unstably as the load changes have been effectively resolved, which provides experimental support for improving the precision of static pressure workbench.