With the electronic control technology applied on tractor more and more widely,the electro- hydraulic steering-by-wire system will be applied on tractor in the near future.The EHSWS has larged force and stronger rigidity than hydraulic steering system.Compared with hydraulic power steering system, it is divided into the steering wheel subsystem and wheel steering control subsystem, and the two subsystem are connected with can bus.the pros and cons of steering performance are extremely important to handling stability , driving safety and the working efficiency of vehicle.During steering, the steering resistance influences steering system ,especially the road feeling part. As the performance test part for development and design of steering system , loading system needs to simulate different steering resistance basis on the actual situation of tractor , which id the important basis of the study on road feeling control.At present , the tractor steering operation condition is poor and complex , and the development of tractor's steering test-bed is immature. In addition,there are a lot of shortcomings in testing methods and means.Hence , a loading steering-by-wire system has been based on the tractor's hydraulic steering-by-wire system has been designed and developed,and related steering loading test has been carried out.