港埠服務系統的良窳影響使用者港口選擇行為的意願至鉅，更甚者影響航商整個船隊經營成本。因而港口選擇係為港埠運輸需求行為分析相當重要的一部份。傳統上航商港口需求選擇行為分析方法，多利用基本統計分析，多利用基本統計分析、變異數分析、多變量對因素分析、群落分析建立系統化分析模式。本研究除使用前述的傳統港口選擇分析法外，並試圖使用灰色系統理論分析法，包括灰色關聯度分析、灰色群落分析，進行港口選擇研究，並簡單比較兩種分析法之結果差異，經過分析結果顯示，二種分析法都能獲得一致且不錯的結果，顯示灰色系統理論適宜用在港口選擇行為分析之研究。

The quality of port service system may have an impact on the shipper’s port selection behavior or even an influence on the cost of the whole fleet, so port choice is an important part of transportation demand behavior analysis. Statistical analysis, analysis of variance, and multivariate analysis are commonly used analysis methods in port selection. In addition to traditional used analysis method, we apply the grey theory (grey relational analysis and grey cluster analysis) to port selection in this study. The results of our study show that both the traditional used methods and the grey theory provide a good and consistent result. The main difference between the commonly used methods and the grey theory is in that the latter can deal with incomplete information, and uncertain causality, and also can provide a good result. The difference mentioned above is also the main advantage of the grey theory.