The effects of contaminant controlled by push-pull ventilation were investigated by using CFD simulation. The results showed that push-pull ventilation may control pollution emitted from worktable effectively and not become the holdback in the workman working. The results also showed that push-pull ventilation may increase the comfort in the workaround. Furthermore, it was also suggested that push-pull ventilation is one of the best way to control contamination of factory and its usage may be generalized.