The paper introduced the basic principle and technical status of the capillary measurement and the key problems of the coal bed methane well capillary pressure measuring, analyzed the problems possibly occurred in the coal bed methane well measurement and solutions and discussed the development orientation to improve the capillary measuring technology of the coal bed methane well. According to the coal bed methane well, a circular space moving type and a concentric fixed type pressure transmission cylinders and the pressure measuring system were designed. A pressure measuring plan was provided to fundamentally solve the difficult problems of the flowing pressure variation measurement in the coal bed methane well. The pressure measuring system could have a comprehensive accuracy up to 0.06% under the 2 m water column pressure, which was obviously improved than the pressure measuring accuracies of other technologies.
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