Through analyzing the contents of metabolites of BHC and derivatives of DDT in the runoff from paddy and corn land in the Western Songnen Plain, it was found that the contents of BHC and DDT were very lower and beta-BHC, which accounted for 73.5%-99.5% of the contents of BHC, was the main metabolite of BHC in the runoff. Among the derivatives of DDT, only p, p-DDT was detected out. Moreover, dissolved form was the dominant species of metabolites and derivatives, but the particles size was one of the important factors which affect on the contents of BHC and DDT in runoff. The ecological risk of DDT in suspended substance of runoff from farmland was lower and BHC had potential risk in the region.
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