The utility model provides a hydraulic system to selectivity and independent ground are carried pressurized fluid to the one or more operating system of machine according to the route of pipeline. This hydraulic system can switch operating fluid flow to another of operating system from of operating system, if the latter among the operating system is just needing hydraulic drive power. This hydraulic system still dispose into the fluid that continues supply nominal volume in order to support one or more miscellaneous function, for example for lubricating system with operating system's the former bearing in relevancy meanwhile carries pressurized fluid to operating system's the latter according to the route of pipeline. It puts with the air defense disguise still to provide recycling to whenpressurized fluid carries to operating system's the latter according to the route of pipeline, allow the fluid hydraulic motor among the former of operating system that recycles.