Correlation among root, stem, leaf and grain is the basis for the establishment of photosynthate partitioning model, and is of great significance for rational regulation of plant morphology and population structure and improvement of crop economic production. The paper is based on experiment results of dry mater weight of root, stem, leaf, and grain of winter wheat of 5 treatments with different water and fertilizer level, and experiment results of soil moisture and soil nitrogen (NH4 + -N和NO3 −+N). The experiment was carried out in the Farmland Water Cycling Experiment Station of Tianjin Agricultural University in 2008-2009. The relationships between leaf to root ratio, stem to leaf ratio, and grain to stem ratio with root nitrogen uptake was established, respectively. The results indicted that the leaf to root ratio, and stem to leaf ratio was more sensitive to water and nitrogen stresses than that of grain to stem ratio. Both the leaf to root ratio and stem to leaf ratio increased with the root nitrogen uptake, and had positive correlations with root nitrogen uptake with the correlation coefficients above 0.91. The correlation between grain to stem ratio and root nitrogen uptake was not significant within the given range of water and nitrogen stresses. The ratio of grain to stem under water and nitrogen stresses was approximately equal to that without water and nitrogen stresses.