Abstract: The influence of glare on humans is an important factor on the research of cab’s lighting environmental ergonomics. For the modern train, more attention need to be payed to the cab’s interface to the purpose of dealing with the porblems faced during the drive, and therefore the glare has the possibility of endangering the safety of driving. The optical simulations were proposed and the principal component analysis method was used to find factors which had great influence on the cab. Combined the results of physical tests and simulations to propose some methods about the main factors that were effective for reducing the glare inside the cab and increasing the visual comfort of the cab. The results show that the console lamp has the greatest effect on the overall light environment of the cab, and recommendations for improvement have been presented according to the results.