The method of iteration suggested by Han is applied for solving Tung's equation. It is applicable to both constant and variable h's Gaussian kernek as well as Gram-Charlier kernel. It can also be used for correcting peak spreading of narrow molecular weight distribution samples.This method of iteration is comparable to other iterative methods reported in literature as far as the calculating time and the accuracy and precision of solution are concerned.The problem of quadrature formula

normalization

symmetrization and pak spreading correctionfor experimental GPC chromatograms after partial smoothing or fitting a curve is discussed.