The PEDOT:PSS film was prepared by using spin-coating method.Combined with th e liquid crystal spacer (LCS) as light extraction material,the OLED device with the st ructure of glass/ITO/PEDOT:PSS/LCS/NPB(40nm)/Alq₃(40nm)/LiF(1nm)/Al(100nm) and its corresponding contrast devices were prepared.By measuring the voltage,current,brightness,color coordinates,the e lectric light emission spectrum and other parameters,the influence of LCS on luminescence prope rties of the devices is studied.The maximum current efficiency of 6.15cd/A with a CIE chromaticity coordinate of (0.31,0.56) at the voltage of 11V is obtained in the device with the LCS,which is 40% higher tha n that of the OLED device without LCS.The CIE chromaticity coordinate changes on ly from (0.31,0.57) to (0.31,0.56) as the voltage increases from 7V to 12V.Reasons are that the introduction of LCS can improve transmittance and destroy the condition of light refraction and total reflection in the device.At the same time,the function layer can form into fold structure,which can make more photons emit from the device.The surface area of the electrode is increased,so the current density is increased, and the injected energy is improved.