On the basis of studying the occurrence and development of social exclusion and its theory,this article presents an opinion that economic exclusion caused by market mechanism is essentially market exclusion,and studies the mechanism of action and the main patterns of manifestation of market exclusion.

Optimum plan of urban drainage system;

The construction quality problem and prevention of urban drainage engineering;

The article introduces the present situation of the urban drainage pipeline network management in our country, analyzes the significance to establish the digitizing management and analyzing system of the urban drainage pipeline network, introduces the present situation and the developme.

ITo counter the difficulty now in the repair of urban drainage piping, the leakage filling by polyurethane and grouting consolidation technology is used to repair urban rainfall popes and sewer within the pipes.

Detailed description is given of a new type pipe, double wall corrugated high-density polyethylene pipe, including its application and the process of construction in city drainage projects, and analysis of its comprehensive economic and social benefits.

From the point of view of city drainage,it is described that SCADA(Supervisory Control And Data Acquisition) based on the technique of Web & “Infranet+Intranet+Internet” not only leads the direction of industry automation,but also greatly improves the construction of city drainage.