The speciations of Cd element are analyzed and the environmental geochemical characteristics of Cd are studied by using sequential extraction procedure and the mathematical model of delayed geochemical hazard (DGH) in the soil of the Dawu River of the Dexing Copper orefield, Jiangxi Province. The results show, total concentration of active specie of Cd(TCASCd) increased when total releasable content of the pollutant of Cd(TRCPCd) increased in the soil of Dawu upper river where is closed to Zhujiacun and Dawu middle river where is closed to hospital of Dexing copper field,and there is a linear relationship between themAlthough samples in the soil of the Dawu upper river and middle river are under the national three level soil standard, the pollution caused by this kind of circumstance which should get more attention than the pollution caused by delay geochemical hazard along with Cd element is constantly input to soil of this region The data characteristics of soil in the Dawu lower river where is closed to Xiagukoucun accord to DGH characteristicsCd element in the soil of the Dawu lower river tends to shift from release of TRCPCd to that of TCASCd , and its DGH model was y=112167E-04x3-625584E-02x2+115298E+01x-607452E+02, The calculation for outbreak of critical point TRCPCd = 18590 ng/g , about 36% of samples the DGH of Cd element is very likely to break out in the soil sampling profile of the Dawu lower river which is closed to Xiagukoucun; meanwhile, this viewpoint is of great significance to early warning of soil Cd pollution and improvement of ecological environment in the study area