Abstract: As the amount of energy is becoming scarce, it is more important to exploit and use bio-energy. In this article, some models had been built through analyzing the inter-relationship among biomass per m², area of biomass having standard coal equivalent(SCE) and cost of producing woody fuel. Then, by the time series analysis method, we estimated the coal future price and compared it with woody fuel cost of partial energy trees. In conclusion, some kinds of trees were ascertained to replace the coal as fuel presently and the feasible bases were provided quantitatively.