Abstract: The contamination status of the relocated contaminated sites of major areas in China was investigated. The contaminated site classification and evaluation index system and the National Priority List were constructed, according to potential threats that the contaminated sites posed to human health and the environment and based on successful experience of regulating contaminated sites in the developed countries. The platform releasing the information of contaminated sites in China was constructed based on WebGIS technology, through which many functions, such as contaminated sites information collecting and editing, query and statistics, Web Map Service, classification and assessment of sites, filtering National Priority List, statistics and analysis of report forms, visual output and system maintenance, were realized. Through the construction of the platform, data exchanges and information sharing among environmental protection departments at different levels were strengthened, and meanwhile the digitization and networking of contaminated sites information in China were promoted.