Abstract: The pot experiment was couducted by way of controling soil moisture to study the effects of water stress on nitrogen nutrition of winter wheat．The results show that water stress affects the nitrogen absorption，nitrogen transport and yield of winter wheat obviously．The degrees of this effect is higher at jointing to heading stage than at heading to early milking，than at early milking to harvesting，than at reviving to jointing stage．The water stress from jointing to heading stage decreases nitrogen nutrition efficiency of winter wheat significantly．