目標：探討旅客面臨生命受到威脅（不安全感的操弄）時與健康預防行為之關係，是否會受到健康意識的影響。方法：運用實地實驗研究法（field experiment），於國際機場進行實驗，103位旅客參與本研究並隨機分派至二組以進行操弄，運用雙因子不安全感情境（高／低）與健康意識（高／低）的設計，請旅客閱讀衛教宣導單張及進行問卷收集。結果：研究發現旅客感受到不安全感時，健康預防行為較佳；旅客的健康意識正向影響健康預防行為。旅客的健康意識對不安全感與健康預防行為之關係亦具有干擾效果。結論：研究發現不安全感與健康意識皆有助於健康預防行為之提昇，特別是對較高健康意識的旅客。本研究運用實地實驗方法，並與常規的衛教宣導文宣進行比較，實證發現更能夠作為國際機場的公共衛生資訊與教育推廣之參考。

Objectives: In the current study we determined the relationship between existential insecurity and health prevention. How health consciousness moderates the relationship between existential insecurity and health prevention among passengers at an international airport was also examined. Methods: A field experiment with a 2 (insecurity: high vs. low) x 2 (health consciousness: high vs. low) factorial design was conducted. A total of 103 passengers participated in this study at an international airport. The questionnaires included questions related to health consciousness, existential insecurity, distraction topic, and health prevention. Results: The results indicated that when passengers have high levels of existential insecurity, they have significantly higher health prevention behavior than passengers with low existential insecurity. Specifically, a high level of health consciousness significantly moderated the positive relationship between insecurity and health prevention. Conclusions: The current study contributes to a better understanding of how insecurity concerns are related to health prevention. The relationship between existential insecurity and health prevention can be strengthened by higher health consciousness. Therefore, this study provided support to develop strategies to facilitate health promotion for the Centers for Disease Control.