250mm 20-hi precision hydraulic rolling mill of sendzimir type has been running. This machine has the first middle shift, B and C roll crown adjustment and other crown  control methods; The main drive mechanism uses AC servo control to achieve speed and tension Control;The automation and AGC system is realized by Siemens S7 1500 PLC, and the thickness of the final Ti alloy strip can be 0.008mm (8μm) . It is the first set of sendzimir type 20-high ultra-thin strip rolling machine in China.