The simplified Ouano’s diffusion equation has been SOlved with a nonuniforln cylindrical pore model for the gel and all appropriate choice of D．(M)=KDM-γ

in which γ．depends on the pore structure．Experimental GPC data in the literature have been suceessfully simulated on a computer with γ．and the pore uniformity parameter φ as two adjustable parameters．The experiments of Haller and of Yau on the flow rate dependence of the elution peak can be explained from our analytical solution of the diffusion equation in Gram-Charliers’series form．Yan’s formula for KGPC can be shown to be not a theoretically strict one．It is pointed out that if V of monodisperse standard amples obey Benoit’s universal calibration，OB

α3B，α4B and peak spreading function G(v一y) should also obey universal calibration．This explains Tung’s experi-mental discovery that OB is dependent on elution volmnes only and independent on chemical constitution of the polymer．Computer simulation has been carried out for the variation of peak spreading function for 160 cases of gel and column operation conditions (4 bead sizes×2 types of pore distribution×4 flow rates×5 packing effieiencies)．Limpert’s experiment concerning the existence of a maximum column efficiency in fine beads of gel at certain flow rate can be explained by our material balance equation，and it is pointed out that the best resolution for polymer sample would not necessarily occur at this flow rate．Approximate relations for calculating Mn(t)/Mn (∞) and Mw(t)/Mw(∞) from the total column efficiency are also formulated．