Abstract: In order to solve the problem involving whether the gas after ground gasification of liquid carbon dioxide can be transported from mine floor to underground with the existing pipeline of the mine, concentration supply system of the non-pressurized ground fixed carbon dioxide gas composed of the low temperature liquid storage tank, the gasifier, the voltage regulator device and the auxiliary pipe valves is constructed. The mathematical model is established based on the technical principle of additivity for the energy loss of fluid in simple piping fluid, which includes the loss along the pipeline, the local resistance of pipe entrance, elbow, valves, and other factors, the useful work of gas itself pressure as the power and the total resistance in the process of transport is obtained and compared by the calculation of the fluid mechanics to prove that the length of the pipeline does not exceed 5 km, the total resistance does not exceed 3.539×10⁵ J/kg, gas from the end of the pipeline can be successfully discharged into the confined space of underground fire area, the maximum length of the pipeline is not lower than 19 km in order to ensure transport feasibility.