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The diffusion coefficient is a key parameter for evaluating the methane diffusion properties of a coal matrix. However, all of the current measurement technologies for methane diffusion coefficients, including the particle method, the steady state method and the inverse diffusion method, have certain limitations. For example, the pore structure of the sample is easily destroyed, and the test time is long. Moreover, the results from different methods lack comparability under the various test principles and conditions. In this work, a new laboratory method for measuring the methane diffusion coefficient in coal matrixes was proposed, where coal matrix flakes instead of coal particles were used as the samples to be measured, and the factors influencing methane diffusion coefficients such as gas pressure, coal rank and moisture content were also analyzed. The results indicate that this new method can keep the intrinsic space …