Abstract: The Φ340 mm MPM plant located at Pangang Group Chengdu I & S Co.,Ltd.is at present regarded as the most advanced MPM plant among the domestic similar type and same sized mandrel pipe mills.Being capable of producing the biggest tube size in the country,the plant has been so far completed,and put into trial production.All the main aspects concerning the MPM plant are described here in the paper,covering the technological configuration,equipment type,process control,layout and the equipment features,etc.Focused on are the newly-developed processes and technologies as applied to the piercing mill,the MPM proper and the slight stretch sizing(reducing)mill,and the process control technologies and quality inspection/measuring/and control techniques adapted for the entire hot-rolling line of the plant.moreover the main technological data of the main mills of the hotrolling line are also presented.