The working stand of roll mill is usually composed of roller, roller bearing, frame, rail support, roller adjustment device, up roller balance device and roller changing device. And other series of auxiliary processing equipment during rolling such as raw material preparation, heating, steel turning over , shearing, straightening, cooling, crack detection, heat treatment and pickling equipment. The type and size of finished or semi-finished rolling mill selection should be decided according to the  machine variety,specification, quality and quantity, and with the consideration of necessary auxiliary, lifting transport and ancillary equipment. Finally the decision can be made referring to various kinds of factors to achieve a balanced choice.