An experimental study on the optimal lumbar support against driver's spine is conducted by using an experimental vehicle having a lumbar support with two adjustable parameters (height and prominence). The results indicate that the optimal lumbar support positions selected by 11 participants are rather stable, obese participants prefer lower and more prominent lumbar supports, and the optimal lumbar support point on spine is basically the same for different participants, but is different in different stages of a relatively long period of driving.%使用带有2个可调节参数(腰靠高度和凸起程度)腰靠的实验车,对腰靠在驾驶员脊柱上的最佳支撑进行实验研究.结果表明,11名被试人员选择的腰靠最佳支撑位置具有较好的稳定性；较胖的人会选择支撑高度较低、凸起程度较大的支撑；对不同的被试人员,腰靠在脊柱上的最佳支撑点基本一致；但在驾驶的不同阶段,被试人员对腰靠的要求也不同.
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