This participatory action research aimed to develop a collaborative model among multidisciplinary teams and Thai farmers for enhanced chemical hazard prevention and evaluated the effects of the model among 18 Longan orchardists (Age 42.50±10.43 years). Participants who met the research criteria were selected using purposive sampling. The research was conducted for a period of six months. Results reported that the model in this study comprised of 4 stages including: 1)the collaborative goal setting for chemical hazards prevention; 2) supporting selfmanagement participation; 3) encouraging and monitoring behaviors; and 4)collaborative reflection and making adjustment to goal attainment. Finding indicated that participants demonstrated significant increase selfmanagement behaviors, with a decrease severity of chemical level accumulation in bloodstream than baseline, and had high satisfaction. The model in this study is effective to encourage self-management for chemical hazard prevention among Longman orchardists. Further research should be replicated over a longer time frame.

Keywords : collaborative model, multidisciplinary team, orchardists, chemical hazard prevention, orchardists.