Abstract: In view of problem that existing gas detector can only detect one kind of gas at the same time, a mine-used portable multi-parameter gas detector was designed. The detector uses microcontroller with low power consumption as core processor. It can complete functions of real-time parameters (temperature, CO, CH4, H2S, O2) detection, information (gas volume fraction, time, temperature, electric quantity) LCD display, alarm data storage and query and wireless data transmission. The actual application shows that the detector has characteristics of portable using, accurate measuring, good visibility and low power consumption.