Abstract: According to Monte Carlo method and 30 years meteorological data of Guangli irrigation district, precipitation of long series (500 years) were obtained. And basic parameters of winter wheat water consumption was studied thourgh 2 years field experiments. Winter wheat irrigation schedules of all years were studied on this base, furthermore, irrigation patterns of all years were analyzed. The results showed that under irrigation quota on each application changed by 30 mm step-size, wintering period and jointing stage needed 30 mm irrigation water respectively,and the probability of highyield was 1% when irrigation quota was 60 mm. With wintering period and green stage irrigation for 30 mm respectively, jointing stage for 60 mm, the probability of highyield was 12% when irrigation quota was 120 mm. With wintering period and filling stage irrigation for 30 mm respectively, green stage and jointing stage irrigation for 60 mm respectively, the probability of highyield was 62.8% when irrigation quota was 180 mm. With jointing stage and heading stage irrigation for 60 mm respectively, others for 30 mm, the probability of highyield was 98.8% when irrigation quota was 240 mm. The research enriches the measures of winter wheat irrigation schedules, and can provide technical support of scientific water usage of winter wheat.