In Miyazaki Prefecture, Japan, a number of farmers adopt the forcing agriculture with the greenhouses. They need to keep template constant inside the greenhouses in winter. In recent years, not only air pollution caused by oil burners, but also land and water pollution caused by excess chemical fertilizer, become problematic in the region. This paper proposes multiple new agricultural policies for the environmental pollutions focusing on Oyodo River basin. The river is the typical agricultural region in Miyazaki Prefecture. Based on multiattribute utility analysis, this paper selects the most preferred policy. The local government unit of Miyazaki Prefecture is assumed to be the decision maker, and the decision maker regards to not only the public interests but also the preference of regional farmers.