Abstract: It's necessary to know in time various parameters such as produced water, gas, and liquid height during CBM (coal bed methane) production so as to adjust production parameters according to the production stage and needs in a timely manner, so that the production of CBM wells is in the best conditions. The in-situ real-time CBM monitor detects mainly the key parameters, including pressure, temperature, flow, vibration and liquid level to achieve the purpose of real-time monitoring of the fluid situation in borehole. These parameters reflect the production, water flow and loss of volume during drilling, and further clarify the coal reservoir pressure, the releasing rate of gas and the distribution of various coal reservoirs to provide the most intuitive and scientific data for the comprehensive CBM development.