This study was to seek the management strategy for the separating garbage discharged in camping site, investigating the interaction effect between sub-component constructs in high order factor the TPB model, which deals with attitude and subjective norms, PBC as the concept of multiple variable. High order factor TPB model is the appropriate model to understand behavior intention than the previous TPB model, because high order factor TPB model has a high explanatory power and attitude, subjective norms, PBC is not single construct, but multiple construct variable. And according to interaction effects between sub-component constructs, perceived difficulty and injunctive norm reduce the impact of instrumental attitudes on behaviour intention. This study suggest that to make low perceived difficulty level and reinforce instrumental attitude is the effective management strategy of separating garbage discharged intention. In the future research, it need to examinate interaction effects using high order factor TPB model for further detail understanding about behavior and intention.