In recent years, many countries have paid more attentions in the issue of alternative energy sources due to energy shortage problem. The biomass energy has the advantages of environment protection and easy access, making the industry develop high performance of the biodiesel production and related products. In this paper, we do not only discuss the principles of the biomass energy and biodiesel, but also investigate the application examples of relative research scheme in Taiwan of recent years. These results provide useful information for the mechanical structure design of the biomass energy.