Forklift is industrial carrying vehicle ,so the requirement for its steering characteristic is higher than other vehicles .According to the concept of the ideal transmission ratio ,and based on the two-degree-freedom model of entire vehicle steering-by-wire system ,the fuzzy control strategy for transmission ratio is designed and the steering-by-wire transmission ratio is studied to further improve the steering performance of system and ensure safety . The calculation and analysis of the data of TE30-type pallet forklift is conducted and the fuzzy design method of the dynamic steering-by-wire system variable transmission ratio of forklift based on vehicle velocity and steering angle is given .The simulation results show that forklifts keep flexible at low speed and dull at high speed with the trans-mission ratio determined by the fuzzy control method and the sensitivity tends to be constant ,so the vehicle maneuverability can be improved and the driver’s burden reduced .%叉车是工业搬运车辆，对于转向特性要求比其他车辆更高。文章根据理想传动比的概念，以线控转向传动比的控制为研究对象，线控转向系统整车二自由度模型为基础，结合叉车自身特点与转向要求，提出了传动比模糊控制策略，旨在进一步改善系统的转向性能。根据T E30型托盘搬运叉车的数据进行实际计算和分析，给出了基于车速、方向盘转角的叉车动态转向系统变传动比的模糊设计方法。仿真结果表明，利用模糊控制方法确定的传动比可使车辆在低速行驶时“灵活”，高速行驶时“迟钝”，使灵敏度趋近于常数，有利于提高叉车操作稳定性，减轻驾驶员的负担。
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