White OLED microdisplays have an important application in the field of information display. In this paper, The vacuum coating system is used to sequentially deposit an Ag/ITO composite film as the anode structure and Mg: Ag composite film is co-distilled to form a translucent cathode structure. NPB is used to hole transport material and yellow light host material, rubrene as yellow light dopant, AND as blue host material, DSA-Ph as blue light dopant and Alq3 as electron transport material. The white OLED microdisplay structure with blue and yellow complementary colors prepared by co-evaporation is Ag/ITO/NPB/NPB∶rubrene (1.5%)/ADN∶DSA-Ph(x%/x=2, 5, 8)/Alq3/Mg∶Ag. The photoelectric performance of the device was characterized by a spectral testing system consisting of Photo Research PR655 spectrometer and Keithley 2400 program-controlled power supply. The effect of blue light doping ratio on the performance of white OLED microdisplay was studied. The result shows that with the increase of blue doping ratio, the brightness of white OLED microdisplay increases first and then decreases, the blue and yellow peaks shift to a certain extent, the color coordinates have a certain drift aod the blue color purity increases. The performances of white OLED microdisplays can be controlled by doping material ratio. The optimized emitting structure of white OLED microdisplay is NPB: rubrene (1.5%) /ADN: DSA-Ph (5%), The device brightness is 3 679 cd·m-2 and the CIE coordinates is (0.263, 0.355) with the driving voltage being 5.0 V.