The hydraulic system is used for the lifting of underwater stage. For its particularity application, the customer requested the concealment of underwater devices, anti-corrosion, anti-rust prevention, oil harmless to the human body, and high-precision control. With mature hydraulic industry experience and innovative technology, Hengli has independently developed and designed the hydraulic system to fully meet customer requirements. The whole system can not only cope well with wet and corrosive underwater working conditions, but also can realize the rapid lifting and accurate positioning of the stage in the water through the accurate control system. Also, the system cooperates with the stunt performers to complete wonderful stage performances.