Abstract: In order to understand the correlation between water use efficiency （WUE）and related physiological traits, and offer some information for genetics and breeding of wheat WUE, the 4×4 complete dialed cross was set up with 4 drought resistant and high-yield wheat varieties. The results of the phenotype and heredity correlation analysis among parents and offsprings show as follows, during filling prophase and metaphase as well anaphase,there was a significant positive correlation or very significant positive correlation between the leaf WUE and the photosynthetic rate(Pn); very significant negative correlation between leaf WUE and interstellar CO2 concentration(Ci) and transpiration rate(Tr); the relation between leaf WUE and leaf temperature(Tl) was the negative correlation, and that reached the very significant negative correlation during filling anaphase; the relation between leaf WUE and stomatal conductance(Cond) show quadratic curve tendency. There are stable correlation between leaf WUE and other related traits druing filling satge, these results could be used in physiology and genetic improving of WUE in wheat.

Key words: Wheat, Dialled cross, Water use efficiency, Phenotype correlation, Heredity correlation