Abstract: To determine the contents of Zn in animal feeds and manures and the input of Zn to the cropland from animal manures, 25,0and 49livestock food samples were randomly selected from small, middle and large scales of farms in crowded cities such as Changchun and Harbin. For the animal manure samples, the numbers were 28,8and 54correspondingly. For three provinces, Jilin, Heilongjiang and Liaoning, the average contents of Zn were 209.35,0.00and 117.58mg/kg in the pig foods, 116.73,0.26and 134.04mg/kg in the cattle feeds and 95.51,7.59and 97.23mg/kg in the chicken feeds, respectively. As for the farm scales, the highest contents of Zn in pig feeds and cattle feeds were from small farms with the contents of 238.91mg/kg and 156.28mg/kg, while it was 103.72mg/kg in chicken feeds in large farms. In Jilin, Heilongjiang and Liaoning provinces, the average contents of Zn were 630.26,6.57and 692.59mg/kg in pig manures, 132.04,8.88and 138.82mg/kg in cattle manures, 363.67,1.82,6.45mg/kg in chicken manures, respectively. For farm scales, the highest mean contents of Zn in pig, cattle, chicken manures were from the large farms with the contents of 691.56,6.13,4.15mg/kg. The contents of Zn in animal feeds significantly correlated with the contents of Zn in animal feeds (P<0.05). According to the production of animals and the average contents of Zn in manures, totally 12,2.7t of Zn was input to the farmland every year in the Northeast of China.