旅遊業為世界經濟中重要的產業，但也對環境造成了很大的影響。 許多國家越來越關注旅遊活動帶來的問題，像是當地生態破壞、產生環境浪費和能源的過度使用。聯合國在2015年宣布2017年為國際永續旅遊發展年。 這不僅引起了旅遊業對永續議題的關注，也因此有許多研究人員開始研究永續旅遊相關議題。

為了瞭解永續旅遊的發展現況，並探討永續旅遊領域中的主要研究方向，本研究自學術資料庫Scopus收集了在 1976 年至 2021 年期間，共 6,573 篇與永續旅遊相關的學術論文。本研究使用主路徑分析來探討永續旅遊的知識發展脈絡，分析出在永續旅遊領域中有三個主要的發展階段。在早期的研究中，較多研究注重於環境與旅遊產業的關係和永續旅遊的概念與定義，之後研究人員開始評估旅遊產業的永續性並探討旅遊產業和氣候變化之間的知識落差，而在近期的研究中，許多研究開始討論旅遊市場的發展和評估永續旅遊的研究現況。本研究也使用了集群分析方法，發現在永續旅遊領域中有七個主要研究方向。在這些研究主題中，永續旅遊和生態旅遊主題之間的知識交流最為密集。為了了解未來的研究發展趨勢，本研究也探討了近期文獻中對永續旅遊的未來研究建議。

本研究提供了永續旅遊領域的全面性回顧與主要研究主題探討方向，藉此可以幫助研究人員和旅遊從業人員更全面地了解永續旅遊的知識發展脈絡和此領域中重要議題。

Tourism contributes to a large portion of the world economy yet causes noticeable environmental impacts. There has been growing concern in many countries on the tourism activities that bring substantial issues in sustainability, including the destruction of local ecology, producing dissipation, and overusing energy. In 2015, the United Nations (UN) declared 2017 as the International Year of Sustainable Tourism for Development. This not only draws the attention of the tourism industry on sustainability but also encourages researchers to study sustainable tourism.

This study aims to review the development trajectories as well as examine the major research topics in tourism sustainability. We adopt main path analysis (MPA) to identify knowledge flow and visually illustrate the development trajectory of the sustainable tourism field. Over the period between 1976 and 2021, a total of 6,573 scholarly papers related to sustainable tourism are collected from the Scopus database. From the results of MPA, we discover that there are three major development stages. The early stage focuses on the environmental relation and the concept of sustainable tourism. In the 2nd stage, researchers begin to assess sustainability in tourism and examine knowledge gaps between tourism and climate change. Research in the most recent stage shifts to discuss the tourism market and assess research status. In addition to MPA, cluster analysis is applied to identify 7 main research topics. Among these topics, the knowledge exchange between Sustainable Tourism and Ecotourism topics is the strongest. Moreover, in order to gain a view on future research, we summarize future research proposed in recent review literature that addresses sustainable tourism.

This study offers a comprehensive review and a state-of-the-art summary in the tourism sustainability field. It can help researchers and practitioners have a better understanding of the knowledge development and significant topics.

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