1 absorbing advanced drving axle tecnoligies at home and abroad 2 using middle-arranged type transmission shaft and swing pin 3 inside structure includes center deacceleration ,transmission differential and end deacceleration with double bevel gears;using whole type axle shell,which hao good rigidity 4 using back-arranged oil cylinder,which has compact structure and beautifull appearance; 5usingdual-action independent lineand full-hydraulic steering;the turning angle can reach50°;the tractor has small turning radius; 6adoptive for 120-180PS four-wheel driving tractor.