The characters of nitrogen content,water potential,free water and bound water in upland rice leaf were studied with pond culture experiment.The results indicated that: The variation of the nitrogen content decreased firstly and then increased and decreased again under different soil moisture.With the adding of soil water content,the nitrogen content and the bound water decreased gradually,but leaf water potential and free water content increased gradually.There is high negative significant correlation between the nitrogen content(y) and the water potential(x) and linear dependence relation of y=-0.6999x 2.3764 after sowing 40~46 days.