In the 103- year plan, we aimed at the infrared gas sensor (IC) , the infrared gas sensor, the infrared gas sensor, the infrared gas sensor, the infrared gas sensor, the infrared gas sensor, the infrared gas sensor, Design, refer to other literature, and use software simulation to design the best infrared gas sensor. The design of this gas sensing system, we hope that this sensor can be installed into the phone, with real-time detection, easy to carry advantage, can really give the sensor in the environmental testing and the value brought about.