The effects of applying CCC solution to wheat seed soaking upon the water and fertilizer use efficiency of dryland winter wheat are analyzed based on the simulating experiment and the¹⁵N-trance technique.The results indicate that the application of 1 jo CCC solution to seed soaking can increase the weight of root in deep soil layer (below 70cm)by 86.4%.To add nitrogen fertilizer with the spring rain.seed soaking in CCC solution can increase the ability of wheat root regeneration and nitrogen utilization by 20%higher than that of the contrast, and it can increase wheat seed production by 16.4%.Thus, it is an effective measure to raise the water and fertilizer use efficiency on dryland winter wheat by the application of soaking seed in CCC solution in connection with nitrogen fertilizer application in spring rain.