This study investigated the discharge character and intensity of main pollutants as TN, TP and COD Mn etc. by industrial manufactories in Liyang City, Jiangsu Province of Taihu basin. The manufactories were included the 18 typical vocations such as chemical engineering, textile and so on. The discharge coefficients of pollutant over products of 10000 yuan and the annual discharge pollutant loads of main industry vocations in Liyang City were calculated. The total annual discharge amounts of TN,

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... TP, COD Mn are 479.9 t, 40.8 t and 1529.7 t by industrial vocations in the city, respectively, equivalent to 2%-3% of external source pollutant loads in Taihu Lake. The discharge coefficients of pollutant over products of 10000 yuan that produced by papermaking, printing and dyeing, chemical engineering and textile industry are extremely higher than others. The evidence has been found that pollutant discharge intensity at the i ndustrial waste streams that was monitored in the nighttime was usually higher than those in the daytime.