Based on environmental impact characteristics of environmental protection check & acceptance for the project completion, the investigation procedure, the key contents, existing problems and some suggests are discussed in details in this paper.

The main environmental problems in the underground gas storage construction were analyzed in this paper, and the main contents of the environmental protection check & acceptance investigation for the underground gas storage completion were discussed.

Settling accounts of a completed project refers to construction enterprise complete the whole contract project according to the content of the contract stipulated,and after qualified by checking and conformed to the contract,settle the final accounts to the contract award enterprise.

Working out final financial accounts after a capital project is completed reflects the benefit of investment of capital project and construction result.

Based on the correct understanding for construction engineering archives social function in this paper author provide some viewpoints that through intensifying the identification work, adjusting saving content and developing new utilization method the construction engineering archives exploitative utilization can be improved and service more better for urban construction.

In order to solve the problems,we should enhance the management,do our best at the file identification,collect and keep the files need to be collected and kept,and deal with the files needed to be destroyed in time.