Abstract: According to the seepage physical parameters measurement at No.16 coal of Gongwusu Area, comprehensive evaluation method is used to evaluate the effect of coal injection. Experimental data show that the seam permeability coefficient is 2.432;the average maximum reflectance of vitrinite is 1.13%; fracture fractal dimension is 1.512 4;porosity is 6%; the average water-coal contact angle is 68.2°. Studies suggest that the injection effect of No.16 coal in Gongwusu Area is moderate coal seam. Extending injection time, using repeated water and other measures are good solutions to enhance the effect of injection. It also can solve the problem of poor cavibility of the top coal and more dust during No.16 coal caving.