The peoplepsilas choice behaviors on travel mode always change according to the different factors such as the destination, trip purpose, type of goods, time sensitive, cost-sensitive, the reliability of transportation system, etc. The multi-objective grey situation decision-making theory (MGSD) has never been adopted in transportation professional field. So itpsilas the first time to apply this method to analyze the peoplepsilas mode choice problems in comprehensive transportation system. A concrete example is also given at the end of this paper and the analysis results show that MGSD has its practicality and reliability in transportation research field.