In order to development and utilize potential biomass energy of agriculture,this paper assesses the energy value of agriculture.using the data of Hunan Statistical Yearbook 2009,we assesed the total amount of biomass energy and could be used for the amount of energy,then the thesis convert it into standard coal to assess the energy value of agriculture.The results showed that the Hunan agriculture energy value was about 24.475 billion yuan,of which the energy value of livestock and poultry feces was the highest,and the potential value of the forest was very big.Related department in making pol...