Abstract: Choosing 5 Chinese Holstein dairy cows with good health, similar fetal times and milk yield as test objects,the change laws of pollutant-producing coefficients of N, P, Cu and Zn of adult dairy cows in four seasons were studied by the method of feces and urine collection. The results showed that the pollutant-producing coefficients of N, P, Cu and Zn of adult dairy cows was significantly or extremely significantly influenced by different seasons. The change laws of pollutant-producing coefficients of P and Zn in four seasons were consistent. The pollutant-producing coefficients in summer were the highest and that in winter were the lowest. And the pollutant-producing coefficients showed a trend of increasing and decreasing.The change laws of pollutant- producing coefficients of N and Cu in spring were the highest and that in winter were the lowect. And the pollutant-producing coefficients showed a trend of decreasing, increasing and decreasing. Therefore the study on the appropriate nutritional needs of dairy cows in lactating period in different seasons could meet the production demands, reduce the feeding cost and reduce the generation of pollutants.