With high-speed development, the natural gas industry will lead and promote the development of related techniques and equipments. This article studies the application of the heater in the gas industry, and indicates that it is an indispensable piece of equipment in natural gas application systems. As a special furnace type, the natural gas heater is the main energy consumer for the process of gas production, transportation, and application. Thus, the development of highly efficient natural gas heaters has become an important research aspect. Investigations and improvements on the structure and heat-transfer process of the heater in order to improve its thermal efficiency are discussed in this article. It is concluded that as a weak point, the heat transfer effect inside the natural gas heater needs to be improved. A simple and effective improved structure of a diversion-type natural gas heater is put forward, so as to help the heat transfer medium form an organized flow and enhance the heat transfer, thus improving the thermal efficiency of the natural gas heater and saving energy considerably. This technology has been awarded a patent in China.