The basic steps of composite resin filling: 1, some cases need to play local anesthesia; 2, removal of decay and dental preparation, the purpose of preparation is to remove some apparently very weak dental tissue, the establishment of retention shape resistance shape so that the remaining dental tissue and fillings are strong enough; 3, acid etching of enamel dentin, so that the surface of the enamel becomes rough, increasing the bonding area; 4, according to the instructions of the dentin, enamel for bond coating, light, and then layered resin pile up; 5, polishing treatment, enamel for bonding agent coating, light, and then layered resin pile up, and then shaped with fine diamond car after pile up; 5, polishing treatment. In general, if any step of composite resin filling is unsatisfactory or not perfect, it will affect the final treatment effect of composite resin and the life of the material.