The present invention which uses as aggregates of various materials to the colored coating to the slag ball milled from the slag generated in a variety of processes requiring the color is possible and can improve the clarity and surface durability of various colors through the coating process over the two the slag produced by the method according to the ball so that it is possible to provide the aggregate production, by injecting a high speed gas in the molten slag generated during the various steps of rapid cooling in the air, comprising the steps of preparing a slag ball; The special primer and a white pigment, the white pigment in the dry slag ball prepared with the base coat comprising, respectively, while mixing slowly added sequentially, and the first coating and dried to drive the mixed slag ball; Color coating of ATO Minimizing slag balls containing; mix incorporating a special primer to see the base coated slag and color coating stage for coating two drive dried and then optionally mixed with a colored pigment of various colors before it is completely dry It provides a method.