Primarily due to self-absorption, there is obvious discrepancy between the spectra from the light emitting diode′s (LED) normalized model and the actually measured spectra. In order to make the model fit the actual spectrum, the modification of LED′s normalized spectrum model is investigated. The self-absorption spectrum is gotten from the subtraction of the spectrum from the normalized spectrum model and the actual spectrum. Through the analysis of the dependence of the peak light intensity and the full width at half maximum in self-absorption spectrum on temperature and the relation between its peak energy and the actual spectrum′s, the self-absorption spectrum′s expression is provided. The fitting expression is obtained by combining Gaussian spectrum model and the normalized spectrum model. The expression is used to modify the normalized spectrum model. Experimental results show that errors by the modified model are less than 4% at various temperatures, thus the spectra from the modified normalized model agree with the actual ones.