Abstract: Coal bed gas content is an important index in the evaluation and regional election of coal bed gas, and it is also an important parameter of coal bed gas reserves calculation. This paper analyzes 3D geological modeling principle and controlling factors of coal bed gas content. In the southern Qinshui basin, a gas content prediction modeling method was established based on the geologic multivariate statistical analysis. The comparison of the gas content experimental data shows that the prediction accuracy is higher., the errors are within 10%, the error of multiple linear regression method is 4.5%, it is the best method. This method has practical significance. The example shows that selecting appropriate controlling factors of CBM and using the multivariate statistical analysis method to establish coal bed gas prediction model have guiding roles for coal bed 3D geologic modeling and CBM exploitation.