For decontamination vehicle with multiple loads, a hydraulic system was designed based on the principle of load sensitive. The hydraulic components were chosen preliminarily. The working principle of the hydraulic system was introduced. The hydraulic system designed can satisfy the requirement that each load speed is adjusted alone, also can satisfy the requirement that multiple loads work at the same time, do not interfere with each other. Hydraulic motor displacement was selected reasonably to make the hydraulic system achieve the best efficiency.