Abstract: In order to study the coal resistivity changing anisotropic properties during uniaxial compression process, Baodian gas coal was drilled at dip angles of 0°, 30°, 60° and 90° and then made into standard samples with dimension of 50 mm×100 mm. Coal samples were tested by resistivity testing system, and Baodian coal sample resistivity changing anisotropic properties were analyzed and summarized. The experiment results show that Baodian coal samples belong to ionic conductive coal, significant anisotropy is observed on the specimens' resistivity. Without loading, ionic conductive coal resistivity increases with the growth of sampling angle. The resistivity perpendicular to bedding planes is less than the resistivity parallel; in the loading process, coal resistivity grows with loading process, and coal samples burst along with resistivity falls when it reaches its peak strength. The resistivity growth model for sampling angle β= 0°, 30°and 60° is linear increase; while β= 90°, it shows inclined "S" curve growth model in the loading process.