Abstract: According to the special performances of a long distance between the coal electrode type coal pile sensor and the controller of the mine belt conveyor, T he laid control cable mode could have an unstable communication, a voltage attenuation and other problems due to the overlong cable According to the working principl e of the coal electrode type coal pile sensor, relying on the geotectonic loop with the conductor features, the coal electrode type coal pile sensor could be applied to rea lize the protection of the coal pile.When the sensor set in a coal pile with a distance of 1 700 m, a long distance application of the coal pile sensor could be conducted.A long distance coal pile protection of the belt conveyor was well realized with the application of the plan in Jining No.3 Mine.