Abstract：In this paper, three key regions of industrial development in China were investigated(i.e., Beijing-Tianjin-Hebei, Yangtze River Delta and Pearl River Delta regions), based on the 496contaminated sites included in the List of Soil Contamination Risk Control and Remediation of Construction Sites from 2018 to 2021. Statistical analysis was conducted on the regional distribution, soil-groundwater excess contamination characteristics, industry contamination correlation and geological conditions of the sites. The results showed that: The contaminated sites of Beijing-Tianjin-Hebei region were mainly located in Beijing-Tianjin and southern Hebei Province. The number of contaminated sites of Yangtze River Delta is the largest and the sites were widely distributed. The contaminated sites of Pearl River Delta is densely located in the Pearl River Estuary. Generally,soil contamination was dominated by the combined contamination of organic pollutants and heavy metals(48.43%), while groundwater was dominated by organic contamination(42.49%). High risk industries were chemical raw material and chemical manufacturing, metal smelting and rolling processing industry, with the risk load index greater than 0.25. The industry types of medium risk contaminated sites were plastics and rubber products industry, machinery manufacturing, metal products industry, electrical machinery and equipment manufacturing, and leather and fur manufacturing industry. The rest industry types of contaminated sites are low risk. The characteristics of the site soil-groundwater contamination were closely related to the historical industries. For example, the chemical raw materials and chemicals manufacturing industry, having the most diverse contaminations with halogenated hydrocarbons (12% of the total) and benzene (10.4% of the total), accounted for a heavier proportion than the rest of the industries. At the same time, heavy metal contamination in groundwater was serious in all industries, and conventional indicators such as ammonia nitrogen should also be noted. The maximum soil depth of exceedance for all types of typical contaminants was generally 0~5m at soil depth. The maximum soil depth of exceedance for heavy metals was greater than organic contamination. In terms of soil properties, the excess contamination was concentrated in low permeability layers such as clayey soils.
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