Abstract: By establishing real-time monitoring system of resistivity variation regularities of loaded coal, real-time resistivity variation law of natural raw coal samples and raw coal samples with different moisture content in uniaxial compressive failure process was tested and studied, and the effect of porosity of the process on the resistivity was analyzed. The testing results show that resistivity of natural raw coal samples increases dramatically when a large-scale destruction of rupture crack, although resistivity of raw coal samples with different moisture content also increases during burst damage, but compares to the natural raw coal samples is more gentle; porosity of raw coal samples with moisture content has a significant impact on resistivity change in damage process, resistivity and porosity change of raw coal samples with moisture content is negative linear correlation before severe damage.