Purpose: To explore the relevant circumstances among hikers on their environmental attitudes and environmental behaviors. Methods: Data were collected from hikers of hiking trails at Kaohsiung and Pingtung area during January to July in 2009 by on-site questionnaire distribution. Overall, 454 valid questionnaires were received in total. Results: First, among dimensions of environmental attitudes, significant differences were found on "balance with nature" in hikers' gender, age, education level, income and experiences of high-mountain climbing, while significant differences were found on "human domination" in their gender and education level. Second, among dimensions of environmental behaviors, significant differences were found on "maintenance of environment" in hikers' gender, age, income and participation of hiking clubs; hikers' gender, age and income on "respect other visitors"; hikers' age, income, participation of hiking clubs and experiences of high-mountain climbing on "plan ahead and prepare"; hikers' gender, age, income, participation of hiking clubs and experiences of high-mountain climbing on "remain the origin"; experiences of high-mountain climbing on "minimize use and impact from fires"; hikers' gender on "leave what you find". Third, low significant relationships were found between environmental attitudes and environmental behaviors. Fourth, environmental attitudes accounts for 13.2% of the total variances on environmental behaviors, in which the dimension "balance with nature" had the best predictive power (11%). Conclusion: Positive relationships were found between the two variables in this study. Based on the research results, suggestions were made for relevant institutions and future research.