A pot experiment was conducted to study the interactive effects of nitrogen,potassium and water on plant growth and potassium uptake of corn seedling.The results showed that height and dry weight of corn plant under appropriate water condition significantly increased by 7.8% and 13.8% than those under deficit water condition.Significant increases in height and dry weight of corn plant by increasing nitrogen application were found,with respective increase of corn height and dry weight by application of medium nitrogen level being 10.4% and 8.7% under the appropriate water condition,and distinct increasing tendency with increasing nitrogen application under the deficit water condition.Distinct increase in dry weight of corn plant by application of medium and high potassium levels under the deficit water condition was observed.Increasing nitrogen application significantly promoted potassium uptake of corn plant under the appropriate water condition.Whereas potassium uptake of corn plant under the appropriate or deficit water condition remarkably tended to increase with increasing potassium for different nitrogen levels.