Excavation and lining are two main important tasks in tunnel construction.Conventional sequential operations may not be appropriate due to time limit for a project and the high cost of construction.The authors developed a new mode of tunnel construction that excavation and lining can be operated simultaneously.The new mode of tunnel construction has been successfully applied to Dahuofang Water Conveyance Project in Liaoning Province.This paper makes a comparison of Main Beam TBMs and Double Shield TBMs used in Dahuofang Water Conveyance Project,and the features of Full-ring Inner-through Lining Shutter Jumbo which solves the problem of interference between excavation and lining.