The research was aimed to examine the participation levels and affecting factors towards the public participation in the plastic scrap separation of Ban Phe Sub-district Municipality in Rayong. The mixed method models of the survey and qualitative research were applied to this study. The research populations determined by the two-stage cluster sampling method were the 388 people with over 18 years of age under the civil registration of Ban Phe
Sub-district Municipality. The qualitative research methods of the in-depth interviews with the key informants, the focus group discussions, and the participatory observations were used in this study.