DHHI started to enter the field of tunnel boring machine from 2003. It has a work team for development and manufacture of shield machine and tunnel boring machine and is capable of independent design and manufacturing of different types of shield machines such as slurry balance type, earth pressure balance type, combined type, etc. and gripper-type TBM, double-shield TBM, etc., of Φ4m～Φ7m, which are widely applied in tunnel or ductwork boring projects, such as metro, municipal Engineering, water supply and discharge, gas transmission, electric power, water division project, etc.