Abstract: Gas geology mathematical model is a new approach for the prediction of coalbed gas contents and coal mine gas emission.It is discussed that the basis theory and modeling tool of gas geology mathematical model,introducing the structure,usage,and characteristic of the software designed by Visual C++6.0 language.The gas contents of the coalbed No.11 of Xiezhuang Coal Mine in Xinwen Coal Mine Bureau of Shandong Province are predicted as an example,reaching up to fine forecast result.