Abstract: Under the condition of Zn-EDTA as the inhibitor and stabilizer, using the luminal-potassium cyanide system chemiluminescence, the effective copper in the soil is determined. The proposed method has good stability and high selective characteristic. The copper picks out limits is 1×10^-11 g/mL, the method linear scope is 5×10^-10～5×10^-7 g/mL, the coefficient of variation is 4.4% mostly.