LEDs (Light Emitting Diodes) are made by the semiconductor material of light emitting devices, due to the relative refractive index than the semiconductor big air, the extract from the semiconductor is often due to total internal reflection of photons and particles trapped in the crystal. Therefore, how to effectively increase the extraction efficiency will be improved brightness light-emitting diode research topics. In order to improve the extraction rate of light, LED surface roughness is usually way to enhance the brightness or silicone resin (silicone) and other transparent materials for packaging. However, these methods will make the light-emitting diode optical and electrical properties deteriorate. In order to improve the light output intensity and the shape of light beam of LED, the photonic crystal (PC) was applied to the LED. The conventional application of LED is back light of flat panel display and indicator. But, with the high output intensity, LED can be applied to large-scale flat panel display. For these reasons, many researches paid their attention to the photonic crystal to increase the light output intensity of LED. The photonic crystal is a periodic structure composed by the low/high refractive index dielectric material or metallic material. The PC would be formed by one-, two- or three-dimensional periodic structure. As the wavelength of injection light is equal to the period of PC, a strong scattering between photon and PC will occur to result photonic bandgap. Consequently, the propagated direction of light in the photonic bandgap will be changed. Recently, the PC was used in the applications of Laser, LED and photo-detector to improve their efficiency This paper mainly cylindrical photonic analog to enhance the efficiency of light emitting diodes , study contains two parts : (a) the variety of different size and high column cited photonic crystal placed in the received light intensity of the surface of the simulation and analysis ; (b) a different number and spacing of the photonic crystal to simulate and analyze the light-emitting diodes emitted light intensity pair. By the simulation results found that: With the increase in the size of photonic crystal light-emitting diodes with photonic crystal light intensity will increase and decrease size . Simulation results indicate that : When the photonic crystal of radius 100nm, 90nm and current column height distribution layer ( indium tin oxide) thickness of 10nm, 200nm of the cylinder spacing below , light-emitting diode light intensity of the strongest .