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Abstract : The rapid development of material civilization today, Sensor technology as a new discipline has been a large-scale development and application. Now that the progress in science and technology and computers, robotics, Control technology embedded microcontroller system and the rapid development of the urgent need for all kinds of sensors. Clearly, sensors in the field of modern science and technology, occupies an extremely important position. Understand, and apply electronic sensors have become professional and technical personnel necessary skills. Based Alcohol Tester example, a detailed explanation of the gas sensor principle, and the actual circuit and the combination of Regarding the specifics of the process were analyzed, gas sensors right to form the basis for the future development of sensors and the application of the trend has been to explore. Alcohol Tester main drivers for traffic police test whether drink-driving case, thus avoiding the transport of hidden dangers, guarantee the safety of vehicles traveling. Associated equipment such as gas sensors : toxic gas alarm, automatic suction device automatic air purification Ventilator also began to emerge in the people's attention. Visibility sensor technology in people's daily life plays an increasingly important role. By reading this paper, readers can see gas sensor principle, the theoretical basis and practical application. Key words : gas sensors alcohol semiconductor gas sensors