Abstract: Abstract：According to the latest data from several energy resource evaluation agencies, the authors make an integrated statistic study of the total resources, supply and demand of the world's energy minerals, including oil, gas, coal and uranium and then analyze the characteristics of their changes. On that basis, they propose the supply-demand balance coefficient S to evaluate the balance and stability state of supply and demand of energy minerals. The lower the absolute value S is, the more balanced the supply and demand will be, but this does not mean the stability of supply and demand; only when S is a low and positive value and fluctuates little on the axis of time, can the supply and demand relationships reach balance and stability. By combining the statistic data from various sources and using the analogy and trend analyses, this paper presents an outlook for the supply and demand relationships of the world's energy mineral resources.