觀光旅遊業已成為二十一世紀的明星產業，根據觀光局統計2015年來臺觀光旅客已達到1,043萬人次，觀光外匯收入更達到4,528億元。觀光旅遊業的迅速發展，不僅可藉由吸引外來觀光客增加外匯收入、創造就業機會，政府亦能以創新思維，推動整合性政策及各縣市行銷策略來振興經濟，藉此提升國民的生活品質。若能找出臺灣觀光發展特色並永續經營，必讓臺灣成為新的區域中心點、成為亞太新觀光中心。 基於上述研究動機，本研究主要探討2014年來臺觀光旅客所參與活動的特性。以交通部觀光局所提供之問卷，進行資料整理並使用決策樹分析，找出來臺旅客所參與各項活動之特徵，進而瞭解來臺旅客旅遊動機、消費情形及休憩滿意度，以供政府及民間相關單位研擬國際觀光宣傳與行銷策略、提昇國內觀光服務品質與國際旅遊觀光競爭力之參考，並持續提升臺灣觀光品質形象，更努力建構質量並進的觀光環境，希望能奠定觀光產業從量變到質變的基礎，達到擴大觀光服務輸出的目的。 / Tourism has become a major industry in Taiwan in the 21st century. According to the Tourism Bureau, Taiwan received over 10 million international visitors in 2015, which generates over 4.5 billion New Taiwan dollars in revenue. With the industry fast booming, tourism revenue is increased and new jobs are created. The government is thus able to boost the economy through innovation in all comprehensive policies and collaboration between cities and counties on marketing strategies, which in turn raises the living standards of Taiwanese citizens. If the industry is developed efficiently and sustainably, Taiwan has the potential to be the next focal point of Asian-Pacific tourism. With the information mentioned above in mind, this study aims to analyze international visitors to Taiwan and activities they engaged in in the year 2014. Based on surveys provided by the Tourism Bureau, it utilizes decision tree analysis to identify the characteristics of visitors and their activities. It further explores their purpose of visit, spending during and overall satisfaction with their stay. In doing so, it could make a positive contribution when the government and tourism-related industries intend to devise future marketing strategies, improve service performance, and build a global image to attract more tourists. All in all, more emphasis should be laid on quality than quantity in order for the tourism industry to expand efficiently and sustainably.