Abstract Green hospitals are a hospital that combines the concepts of ecology, energy conservation, environmental protection and health. The past studies found through the literature collection of green hospitals that the concept of green hospitals is also consistent with the principle of steady-state economy. It is not based on human-to-human thinking, but on the connection between people and the environment and ecology. Producing better efficiency, reducing energy consumption, and reducing the amount of waste or using it again, the introduction of green buildings and green hospitals can not only improve the efficiency of energy saving and carbon saving, but also effectively reduce emissions and waste in the production process. Green hospitals are the development trend of hospitals in the future. As for the operational performance, most of the hospital's income comes from health insurance, but the health care losses have increased year by year. The hospitals need to reduce their expenditures. This will not only reduce the hospital's energy expenditure. It is also match international current policies and energy conservation trends for energy, which will help improve the overall image of the hospital. However, many hospitals in Taiwan still stay in the process of updating and replacing equipment as a means of reducing energy consumption, and building new equipment with better energy efficiency values. However, there is a lack of communication and education for personnel, and there is also a lack of communication with the staff in the hospital. With good equipment, it is unable to achieve good operational mechanisms and technology. Therefore, if hospitals want to make their equipment economically efficient, they should carry out various environmental protection and energy-saving education promotion activities for hospitals, and they can implement policy-oriented environmental awareness and education, and establish indicators so that the hospital implements the standards. Therefore, the purpose of this study is to construct indicators suitable for the development of green hospitals in Taiwan hospitals, and to explain the willingness of green hospitals to adopt environmental protection behaviors, and to analyze those factors that will affect the willingness of hospital staff to adopt environmental behaviors. The study investigated three green hospitals in Taiwan and received 220 valid responses. The results show that the 11 green hospital indicators constructed in this study are indeed suitable as indicators for the evaluation and development of green hospitals. Respondents believe that the purchase of green equipment and the strengthening of education and training are the projects that the hospital should strengthen. The concentration of government decrees and continuous subsidy programs, the establishment of dedicated counseling units, and the strengthening of green sustainable education within hospitals are the biggest difficulties in the development of green hospitals. Respondents have high score on psychological variables. Water resources, air quality and waste management are indicators that respondents believe that environmental management performance is better. The performance of environmental education indicators still needs to be strengthened. The green hospital's environmental behavior model can match the ideas and behaviors of green hospital employees. Attitude, subjective norms and perceived behavior control will positively influence the willingness. Based on the results of the study, the study proposes the following recommendations: I. It is recommended that the government establish a green hospital promotion unit with unified powers and responsibilities. 2. It is recommended that the government implement the green hospital review standards as soon as possible. 3. Enhance the incentives for hospitals to promote green hospitals. 4. Provide exclusive education courses and training for green hospitals. Keywords: green hospital, the theory of planned behavior, environmental behavior