Available amount of biomass in rural area is limited in Korea. Woody biomass from thinning in forest is unavailable due to its high collection costs. Plastic waste produced from greenhouse is potential fuel for gasification in rural area since thermochemical gasification can use not only biomass but plastic wastes. Mixed fuel with biomass and flake of low density polyethylene (LDPE) supplied Korea Environment Corporation. When the amount of waste plastic is less than 30% of biomass, reaction and syngas quality was reasonable for fuel gas. Co-gasification of biomass and plastic waste resulted in higher concentration of hydrogen in syngas, compared to gasification with biomass only. Considering the limited amount of available biomass, co-gasification with plastic wastes seems promising to provide cheap gas fuel in rural society.