The efficiencies and uniformities of the backlight are mostly determined by the light guide plate which is an important component of the edge-lighting LED backlight. The optical properties of the LED for most of LGP (Light Guide Plate) design model had been neglected, and multi-layer optical films had been used. In this paper the trans-mission process of light-beam within edge-lighting LGP has been analysis with an intensity distribution model of multi-LED to derive the rule of netted dots arrangement. A formula of dots arrangement and the design method were obtained. Then the edge-ray theorem was used for micro-prism which is on top surface design. At last the optical simulation software was used for simulation and analysis, we compared with other design methods and the results show that this structure can easily eliminate the phenomenon that the brightness uniformity of the place near the source is not high, at the same time it can effectively reduce the number of prism film in maintaining the brightness of the LED backlight and Simplified the structure.