In this paper,white phosphorescent organie light-emitting devices (OLEDs) were prepared with blue phosphorescent layer and yellow phosphorescent layer,and the yellow light-emitting layer is composed of red a nd green phosphorescent materials.The device structure is as follows:ITO/MoO₃(30nm)/NPB(40nm)/mCP:FIrpic(8%)(50n m)/CBP:R-4B(1%):GIrl(14%) (5nm)/BCP(10nm)/ AlQ(40nm)/LiF(1nm) /Al(100nm) (x=2,3,4,5,6nm).By comparing the efficiency and brightness of the device,it′s indicated that the device has the best performance when x=5nm.The maximum brightness is 9471 cd/cm²,the maximum current efficiency is 23.5 cd/A,and color coordinates are ( 0.32,0.35).From the experiment, the reason for affecting stable color and low efficiency is the movement of exci ton recombination zone because of the different responses to the drive voltage f or electron and hole mobilities.