Abstract: Good vision is a important safety factors in operation forklift. This paper have studied on the
visual field forklift truck. A virtual driving operation model for forklift truck was proposed by means of
sight box-plot method and applying ergonomic simulation software-Jack based on the 5th percentile
Chinese adults body size. And Identified the drawbacks of present forklift truck existing in its front
view and rear view and while loading and unloading goods at a certain height. Then we proposed
corresponding suggestions on how to improve this and optimize its design, such as install onboard
visual system and optimize the roof of forklift. Furthermore, the results of optimisation was validated by
means of a case study, demonstrating its capacity to reduce blind angle of sights, which is of some
significance for forklift design.

Key words: ergonomics, virtual simulation, Jack, forklift, visual field