Abstract: The waste drainage of industry is affected by its scale,structure,composition, technology and equipments, as well as the environmental management and policy. This article selected some key indexes in water pollution and analyzed the relationship between the scale, structure, technology of industry,as well as the investment of environmental management. It is showed by this study that the enlargement of industrial scale has not caused the increase of waste industrial drainage, with the adjustment of industrial structure, the improvement of technology and implementation of standard drainage policy in the Yangtze River Delta. As to the industrial structure, some industrial drainage are sensitive to adjustment of their structure,but others are not. The improvement of industrial technology and investment of pollution control have negative relationship with industrial waste drainage, which means that the improvement of industrial technology and pollution control play an important role in the decrease of industrial water pollution.

Key words: waste drainage of industry, scale of industry, structure of industry, improvement of technology