The construction of urbanization is developing rapidly, and the energy consumed by the heating demand is also increasing. The air pollution in the northern winter has been greatly aggravated. The total amount of industrial waste heat is very considerable. Recycling industrial waste heat for central heating, can reduce the heating energy consumption significantly. Solar energy, air energy heat pump and other distributed energy, have very rich resources, and it will not cause pollution and damage to the environment by using them. Increasing the proportion of such energy, can greatly reduce the energy consumption caused by heating and environmental pollution, and help ease the air pollution in the north. Taking the supply of domestic hot water as an example, this paper introduces and compares a variety of heat supply forms, and obtains the most cost-effective and most clean way. It is proposed that the heating system based on the combination of distributed energy and recycling industrial waste heat, has obvious advantages over single central heating or distributed energy heating system.