Numbers of researches indicate the environments which can provide tranquility also provide restorative effects to restore people from attention fatigue, negative emotions, and facilitate people to feel peaceful and quiet. Researches for characterizing tranquil environments are still lacking and are still measuring the tranquility by laboratory survey. There are a few numbers of researches for exploring the relation between tranquility and environment audiovisual elements which were measured by field survey. The purpose of this study is to explore the relation between environmental audiovisual elements with tranquility, negative emotions, perceived restorativeness, and heart rates by on-site surveys. 390 participants were invited to walk around a campus for 30 minutes, and wearable devices were used to continuously record the heart rates, G.P.S., environmental sound and fill out the questionnaire of tranquility, perceived restorative scales by pop-quiz. Videos were also recorded to evaluate green view index, sky view factor, and the number of people encountered. Results indicated that a higher green view rate in the environment, especially near water, enhanced the sense of tranquility. However, higher environmental sound levels, lower green view rates, and more encounters with people increased feelings of anxiety. Fewer encounters with people in the environment led to feelings of stress. Environments with higher openness and more encounters with people reduced perceptions of restorativeness. The heart rates were found to be more moderate with higher environmental volume, higher green view rates, and lower landscape openness. This study conducts an in-depth investigation into the effects of audiovisual factors from the campus environment on health. It also establishes a method for assessing healthy environments to offer guiding principles for campus administrators and planning designers.