The study on migration patterns of chlorpyrifos with runoff was carried out by simulating rainfall. The re-sults showed: (1) Chlorpyrifos concentration in runoff increased significantly with the increase of spraying dosage, spraying times, and soil slope, and chlorpyrifos concentration in surface runoff was significantly higher than that of surface runoff. (2) Correlation analysis indicated that chlorpyrifos concentration in runoff didn’t conform to the line-ar regression relation with chlorpyrifos spraying dosage, spraying times, and soil slope. (3) Chlorpyrifos concentra-tion in runoff was less than the standard of national under the highest dosage was 1. 8g/L, spraying times were 4, and the highest soil slope was 15°, but it would be polluted water if these dosages, spaying times, and soil slope was conducted for long times. In conclusion, when the spaying dosage was less than 1. 2, spraying times were less than 3, and soil slope was less than 10°, chlorpyrifos concentration would not pollute water environment.%以毒死蜱为供试农药，采用模拟人工降雨方法研究了毒死蜱随径流迁移的规律。研究结果表明，(1)喷施毒死蜱后进行模拟降雨，随着施药浓度、喷施次数和土壤坡度的增加，径流中毒死蜱浓度显著增加，且亚地表径流中毒死蜱浓度显著高于地表径流；(2)毒死蜱喷施浓度、喷施次数和土壤坡度与径流中毒死蜱浓度之间均不符合线性回归关系；(3)在最高施药浓度为1．8g/L、连续喷药4次和最大土壤坡度为15°时，径流中毒死蜱浓度尚未超过《有机磷农药工业水污染物排放标准》规定毒死蜱的排放浓度，在本试验条件下常年施用毒死蜱有对水环境造成污染的趋势。当喷施浓度在1．2g/L以下、连续喷药3次以下及最大坡度为10°以下时，径流中毒死蜱浓度不会对水环境造成污染。
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