In order to illuminate water use characters of wheat in Henan province and attach importance to water resources utilization,four treatments,i. e. no irrigation,one irrigation in jointing,two irrigations in elongation and anthesis and four irrigations in turning green,elongation,anthesis and grain filling were set and the effects of different irrigation frequency on water utilization and yield formation was studied using the cultivar‘Zhoumai 18'which had high yield in field experiment. The results showed tha...