Abstract: The current status of coal mining in China was introduced.The migration law of overlying strata and the basic conditions for the formation of continuous curved beams in backfilling mining were analyzed,and the quantitative relationship between continuous curved beam,filling density and key layers was obtained.The characteristics and technology of preparation and transportation of filling materials,solid filling equipment,roadway solid filling and working face solid filling technology were described.The integrated technical equipment system of solid filling mining and filling parallel operation,automatic control of filling and the integration of "mining,processing and filling" in underground coal mine were analyzed.In order to ensure the long-term effect of filling,a modified bulk solid filling technique was proposed.It is believed that filling mining should make efforts to build ecological mines in the whole process with precise filling.