This study uses mixed method and participation action research to find the suitable model to promote farmers utilize biomass materials from growing corn instead of burning outdoor in 3Sub-district, Mae Jam District, Chiang Mai. The researcher studied data and documents about how to get rid of biomass materials from corn so as to demolish biomass materials from corn and then tested capacity of crusher and even production capital. After that, extension model would be developed to be used in promoting farmers to utilize corn biomass materials instead of burning in farm. To develop such model of promotion, the researcher arranged public meeting to mutually develop such model of promotion for farmers to distribute corn biomass materials by holding their satisfaction to such model. For investment worthiness, income from selling biomass materials and convenience of management, when receiving promotional model, the researcher would test in 3Sub-district by using participation action research to test suitability of proposed promotional model.