This paper presents an analysis of the data from tlxe experiment on potential productivity of rainfed wheat field carried out contin uously for five years an a flat field of 66 m×100 m in Fengqiu.The results showed that under the condition of sufficient fertilizer supply,the potential productivity of the rainfed wheat field ranged from 3450 kg/ha to 5625 kg/ha,with a confidence of 74.8% obtained by the statistic analyses of water charactristics for the five wheat seasons and of the distribution of water in Fengqiu for all the previous years.The correlation between the wheat yield and the total water consumption was not obvious (r=0.67).In addition,it is worthwhile to mzntion that the water utilization rate of ≥0.75 kg/mu·mm for the five wheat seasons was remarkably higher than that in Fengqiu region (0.475 kg/mu·mm) and that in Huang Huai Hai region (0.46kg/mu·mm).This implies that the increases of fertilizer supply is also an effective approach to increasing water utilization rate of the farmlands.