Turning mechanism is important assemblies for tracked vehicles.Turning performance is important evaluating indicator. The performance of the turning mechanism directly affect the mobility and productivity of the crawler.However,there are still some problems crying out for solutions in superior turning mechanism for vehicle engineering area.Composition and performance of turning system in agricultural tracked vehicles matched with twin driving differential turning mechanism was introduced,which adopted quiet hydraulic double pumps and double motors,took advantage of flexibility greatly for track vehicle turning and benefit for handling used steering wheel. Turning performance is important assemblies for tracked vehicles. Turning performance is important evaluating indicator. The performance of the turning mechanism is affect affect mobility and productivity of the crawler. Host, there are still some problems crying out for solutions in superior turning mechanism for vehicle engineering area.Composition and performance of turning system in agricultural tracked vehicles matched with twin driving differential turning mechanism was introduced, which adopted quiet hydraulic double pumps and double motors, took advantage of flexibility for track vehicle turning and benefit for handling used steering wheels.