In the prior art, the adjustment of the rolls when changing specifications required highly skilled adjustment workers. Due to uncontrollable human factors, the scrap rate at the time of unit lead is relatively high, and the adjustment time is relatively long. All these seriously affect the unit yield and production efficiency. Our company’s ERW pipe mill has established a comprehensive database. When changing specifications, only the diameter, wall thickness and other parameters need to be input. The computer will call the database to adjust the position data, and the computer will drive the roller to reach the correct position. After the position is automatically stopped, the direct tape can be produced, which reduces the adjustment time and adjustment errors, and reduces the scrap rate when leading. This adjustment technology, combined with the molding machine without the replacement of the roll and the quick-change roll sizing machine, the time for the unit to change specifications can reach within 2-3 hours, and it is in the leading position in the world.