Abstract: Through the theoretical analysis about the actual exhaust situations in coal mine underground refuge chamber, the factors affecting the size of exhaust speed were determined. The exhaust speed not only had relation to the amount of wind that the external air pressure system provided for the coal mine refuge chamber, but also concerned with the internal and external pressure difference and the diameter of the exhaust pipe. Because the exhaust speed is influenced by these factors, under the condition of internal and external pressure difference within a certain range, in order to ensure the internal air quality, the quick exhaust equipment was designed in some aspects, such as the function of the equipment, energy conservation, simple operation and so on, which met the requirements of no high-power and large capacity power, no safety risks, simple maintenance, economic practicality for coal mine underground refuge chamber.