The method of Gaussian peak area computation includes count accumulation method and least squares fitting of Gaussian function.The latter is based on solving inverse matrix.This requests considerable computing time

and is sensitive to noise.In this article

we obtain the amplitude

center and variance of Gaussian function by using the second eigenfunction of Gaussian function

and area of Gaussian peak is calculated.Results of applying this new method to γ-ray spectra analysis show that it is not only of quick speed but also insensitive to noise.