Abstract:Analyzing the unstable reason of GaN-based blue light LED peak wavelength,it was the quantum restriction Stark effect caused by the multi- quantum well area. Some measurements can improve the stability of wave length by discussing the electric field through the attenuation pressed,using four Yuan departments structures, optimizing extension material growth condition and total variables. Then, it pointed out the most superior plan for enhancing stablity of GaN -blue light LED peak wavelength.