With the continuous development of our national economy, is also growing demand for coal, which makes the coal mine production safety is facing a very serious problem. Frequent occurrence of coal mine accidents, caused by many reasons, many of which are caused due to gas explosion. To prevent a gas explosion accidents, in addition to strengthening the management of underground workers, improving underground working environment, but also the need for accurate and reliable for a wide range of gas sensors and other gas sensors, these sensors need to be very precise detection of gases and transmit signals to the alarm, timely treatment to be effective. 
Coal mine gas is composed mainly of methane by methane-based gases in general. Sometimes refers to methane alone. The volume fraction of gas in the air reaches a certain level (5% to 12%) when, under certain conditions, can occur with the oxygen in the air to form a violent chemical reaction gas explosion in coal mines pose a serious security threat. Of coal mine gas monitoring technology has gone from simple to complex, from a low level to a high level of development process. The early founding of New China to the 1970s, coal mines are mainly using optical gas downhole Calibrator, wind tables and other portable detection equipment downhole environment parameters. The early 1960s, China began to develop carrier catalytic components, along with raising the level of sensitive components manufacturing and development of electronic technology, especially in large scale integrated circuits, micro-computers extensive application of surveillance technology has entered a new period of development. 1970s, the advent of gas power meter, equipment in mining face, such as the return air port road underground fixed location, to achieve a continuous gas detection and automatic gauge control equipment to be automatically cut off power supply. Then, gradually developed a portable gas monitoring alarm detector, gas alarm miner's lamp. 1983 to 1985, from the United States and Europe has introduced dozens of sensors monitoring systems and ancillary equipment and portable instrumentation coal mine and, accordingly, the introduction of some monitoring systems, sensors and sensitive component manufacturing technology, which promoted the development of the mine safety monitoring technology. After 1983, there are a variety of models of domestic mine monitoring system passed the technical appraisal, the progressive realization of the right of coal mine safety, production and continuous monitoring of various parameters, monitoring, data storage and data processing. In recent years, with the invention of the computer and applications, especially networking and information technology continues to evolve, to provide opportunities for gas control conditions, coal mine gas monitoring network system came into being. The equipment and systems promotion and application, rich in coal mine safety monitoring products in the market, improving the appearance of coal mine safety technology and equipment, reducing the level of our country and foreign advanced technology gap. 
Although aspects of science and technology in mining equipment and materials with the largest improvements, but occur frequently, such as gas explosions, coal and gas outburst, such as mine water inrush serious accidents. For coal mine safety production common, critical and forward-looking technology issues in order to mine accident factors - gas, dust, floods, such as focusing the research object, to strengthen scientific and technological research, improve the ability to identify mines major disasters, monitoring and early warning capacity, prevention and control of current coal production capacity is the primary task. Coal mine safety equipment as well as various gas sensors are an important means of prevention and treatment of coal mine accidents, accidents in the prevention of disasters have played an important role, but there are still a lot of equipment not adaptable, poor reliability issue. As is now commonly used in underground methane gas sensor has the following disadvantages: 1. Catalysts have life gauge. Different environment is not the same degree of deterioration, life is not necessarily, but the approximate value can be presumed. 2 catalyst species have caused rapid deterioration due to moisture, the manufacturers of products is not the same, according to the intended use of the premises to do some research and then decide. 3 Over the outbreak limit (HEL) concentration in the combustion gas leaving the output can not be reduced. Using this anti-farming pay special attention to risk-prone. Consideration given to the current status of the development of new gas sensors will not only help improve work efficiency cost savings, more conducive to the protection of the mine safety.