Taking the coordinated development of energy, economy and environment into account, we use the concept of environmental DEA technology and measure efficiency by expanding the traditional DDF model and use the expanded DDF model to analyze China's energy efficiency. The result has shown that different regions show different energy efficiency. The highest energy efficiency region is the three major cities, while inefficiency concentrates in the western region. Meanwhile, the cost of environmental regulations in the western region with a lower energy efficiency shows a shape of W.