Abstract: Due to the complex geological and hydrologic conditions in water rich pebble layer, the construction of metro tunnel crossing underground the area is very difficult. It is easy to cause tunnel vault collapse, which has become a major problem in metro construction. In the mined tunnel vault collapse of a section on Urumqi metro Line 4, comprehensive treatment measures are proposed. When a local collapse happens at the tunnel vault, the tunnel face should be reinforced, the leading small pipe of the arch and the radial anchor pipe be added to strengthen the wall rock of the arch, so as to stop water gushing from the vault collapse.