Abstract: Drivers'workload is measured at sites with promise on National Highway 109 Ning Xia HUI au- tonomous region section through eye tracking,heart rate(HR),breath and skin resistance (SR) from the driver's psycho-physical aspect.The main purpose is to quantitatively analyze and compare the workload be- tween ordinary segment (on straight line segment) and at sites with promise (on high radius curve and urban- ized intersection),and then to evaluate the effect of safety improvement and give efficient suggestions from human factors aspect.Results have shown that workload at sites with promise is much greater than that at or- dinary segment,but effect of the safety improvement on curve using signs and markings is far from expecta- tion,Some corresponding measures are also put forward to improve safety from combination of engineering and ergonomics.