Dust-proofing water consumption was a basic parameter for optimal design and hydraulic reliability analysis of water supply network in coal mine, the forecast of dust-proofing water consumption calculated by water consumption measured and the periodical regular of consumption found was significant for programming of water source, dispatcher of water supply, reconstruction of water supply system and assessment of system reliability. To accurately forecast the dust-proofing water consumption, an adaptive single-exponent smoothing model was established, in the case of water consumption measured in Qianjiaying Mine, Kailuan Group, validity of this method was verified.