Paris Agreements regarding carbon reduction constraints urges nations to promote developing clean energy up to national strategies. Distributing gas power generation is widely used worldwide thanks to its energy saving and environmental protection. Gas-heating-electricity united projects amount up to 70% with high efficiency, strong peak-adjusting capacity and high environmental benefits, which is a vital means in using gasThis paper analyzes the economic benefits of gas-heating-electricity united projects in 28 provinces based on depreciated cash flow, and presents suggestions on governmental planning and leading, companies’ selecting locality and deceasing investment costs to acquire higher benefits

China has long been using the coal as the major energy, leading to a severe environmental pollution. China is speeding up to reform the natural gas marketization so that coal-made gas as a supplement to the routine natural gas gains a fast growth, but remains its economy and environmental impacts questionable because a carbon emission accounting model of coal-made gas has not been systematically established in China, which is fundamental to study its carbon emission. This paper uses mass balance to emission factor to set up a carbon emission accounting model of coal-made gas in its entire life cirle that is employed to estimate the carbon dioxide emission based on a case study on KQ coal-made gas in its entire life circle, and compares it with the traditional coal path, and presents suggestions for China's coal-made gas industry on low-carbon emission reduction, offering references and decision-making basis in promoting coal-made gas industrial development.