Abstract: In this paper， the structure and working principle of tractors hydraulic steering by\|wire system were presented. By analyzing the characteristics of tractors steering road feel， two parameters， the steering cylinder piston rod force and the tractor speed， were adopted as road feel information source. Based on the requirements on steering road feel characteristics of hydraulic steering by\|wire system， a comparatively ideal curve of road feel characteristic curve was chosen finally. The relations of steering road feel， the stress of steering cylinder piston rod， and vehicle speed were clearly analyzed. The experimental testing method was employed. The maximum values of the stress of steering cylinder piston rod under different vehicle speed were measured while the hydraulic steering tractor was doing steering test on soft soil ground. The speed sensing curve was well fitted， and the curve steering road feel characteristic curve was then introduced and designed. The curve indicated that the designed curve steering road feel characteristic curve could well coordinate the contradictions between operating handiness and steering road feel.

Key words: tractor, hydraulic steering by\, wire, road feel, curve\, characteristic curve