Renewable energy is one of effective measures to decrease GHG emission. Its installed potential should be evaluated in a specific area, because renewable energy is a local energy. Especially, biomass energy should be evaluated in a region, because it has a wide geographical distribution. High costs for transportation, feedstock, and energy conversion are obstacles to promote the utilization of biomass energy sources. In this study, usable biomass potential and locations of biomass power plants are estimated by using Geographic Information System (GIS) and an optimal method in Guangdong Province. From the model analysis, we can obtain an optimal transportation process and the number of profitable conversion plants for woody biomass resource. In the optimal case, the installed biomass power plants are five units with the range of power capacity from 23.5 to 43.5 [MW], and its total annual power generation is 1135.5-1228.8 [$10^6kWh/yr$] in Guangdong.