As the largest user of Shanxi natural gas (coalbed methane) gas structure, gas power plant's requirements for gas quality directly affect the dispatching of Shanxi gas pipeline network.Moreover, according to the investigation and analysis of the gas-fired power plants in operation, there are some problems such as unstable calorific value and blockage of filter screen, which brings hidden dangers to the operation safety of gas-fired power plants.Combining with the actual situation of gas consumption in Shanxi gas power plant, this paper analyses and calculates various modes of gas mixing, and gives several modes of gas mixing in gas power plant, which can provide reference for gas source dispatching in gas enterprises.