In this thesis,optics software Trace-Pro was used for simulation.Eighteen white LEDs was used around the 7 inch LGP.A novel design of dot pattern density and distribution of LEDs is invented。With six LEDs on top and bottom and three LEDs on each side and on even distribution dot of LGP,a light efficiency equal to 91.64%,comparing to convenient CCFL 53% is obtained。Also,its light uniformity has reached 92.69%, which is satisfying the industrial standard.