In order to realize the main factors affecting intensity distribution of light emitting diode

optical model of the traditional light emitting diode was constructed

which was based on the luminescence principle and structure of the traditional light emitting diode. Intensity distribution plot of the light emitting diode was obtained

and comparison was carried out between data measured by the manufactory and the results got from this research. By changing the field angle of the reflecting cup successively

the distance from the top of the light cup to the bottom of the light emitting diode

the refractive index of Araldite and the dimension of the optical lens

it appeared that light emitting diode owned different intensity distributions

and four groups of intensity distribution plots were got. Experiental results indicate that with the field angle of the reflecting cup being enhanced

the depth of framework thrust into the light emitting diode being increased

the refraction coefficient of Araldite being enhanced and the dimension of optical lens being increasing

the intensity distribution changes abiding by some laws

and these laws could be used to guide the production of light emitting diode.