Abstract: Elaborated in the article are the main equipment units that the rolling line of the mandrel pipe mill is made with,the function of the roll stand center checking system-the pass station,and the checking steps for the rolling line of the PQF mill.An in-deep analysis of calibration of the rolling line is conducted,based on which a suggestion for setting up the pass station for existing mandrel mill plants or those to be constructed in order to ensure the accuracy of the rolling line for better pipe quality.