1. Using earth pressure balance principle to complete the construction of a rectangular full-section tunnel.

2. Low construction disturbance to surround soill, no disturbance to the transportation and architecture on the ground.

3. High space utilization rate, fewer construction area.

4. No noise and environmental pollution during the construction.

5. Designed for tunneling cross streets, subway stations, side passages of underwater tunnels, underground tunnels crossing highways, gas and electrical power pipelines, etc.