Remote sensing interpretation and study on methods of locating the illegal constructions were performed for oil refineries and coal burning boilers. Remote sensing images of BTH area in 2014 were acquired. Through the general survey of refineries, steelworks, cement plants, thermal power plants in BTH area in 2014, we got coordinate information of major atmospheric point sources, unorganized stock yards and so forth, and we analyzed the stated of dismantled and shutdown steelworks, thermal power plants and cement plants.