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. 

 This paper, based on natural gas's system structure characteristic scale, uses non-linear planning to establish natural gas coordination scale and optimization, discusses China's natural gas coordination scale and optimization, and analyzes its rationality and sensitivity, and presents suggestions in optimizing natural gas coordination scale. Natural gas coordination level is good, variable coefficient is poor, month peak coefficient is excellent, urban emergency coefficient is poor, county emergency coefficient is good in 2014. Compared with moderate scale, the optimized natural gas coordination scale rises 0.15 in sensitivity in large scale range, and rises more, up to 0.198 in small scale range, indicating a good anticipation. Natural gas coordination scale is most sensitive in large scale range. This paper proposes the optimized natural gas coordination scale plan be the basis in evaluating China's natural gas industrial development and planning. This optimized plan can not only precisely scale natural gas coordination, but also be of significance in sensitively reflecting natural gas coordination change, which is influenced by natural gas use planning, development and construction.