Abstract: A weighing & length-measuring system for the large-sized LSAW pipe is designed to overcome the shortcomings of the currently-used relevant weighing & length-measuring system, including structural complexity, high manufacture costs, poor measurement range coverage, and low precision, etc.Focused on are such aspects as the technical parameters, equipment configuration features and operating principle, et.The said weighing & lengthmeasurement system can be located just at one operation station of the production line to perform on-line large measurement range mass weighing and large range length-measurement.The system is in possession of such advantages as structural simplicity, low manufacture costs, measurement accuracy as meeting the design criteria, and adaptation to the required overall production cycles.