Abstract: The method of determining chloryrifos residue in soil and water was described and the method was adopted to investigate contamination of chloryrifos in the soil and surface water of the neighborhood of a golf course that had used the pesticide. The results showed that the concentration of chloryrifos was < 0.4μg/L, much lower than the criterion (4μg/L) set by MHW(USA) for residue of the pesticide in drinking water in golf courses.