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We investigate the electronic structures and magnetic properties of ZnO doped with N,Cu,and (Cu+N) by using a first principles method and considering the strong correlation effect.It is interesting to compare these three systems.ZnO:N has weak p-type doping and unstable ferromagnetism,while ZnO:Cu becomes insulating due to the Jahn-Teller effect.Cu and N codoping can not only greatly improve the dopability of p-type doping accompanying the Jahn Teller fading,but also enhance the ferromagnetism at the same time.The calculation results indicate that there is a win-win effect between N and Cu dopants in the ZnO:(Cu+N) system,which could possibly find applications in spintronics besides optoelectronics.