Abstract: The research on surface modification of finely ground calcium carbonate (GCC) with aluminate (ACA) accompanied by simultaneous wet ularafine grinding in stirred mill is introduced in this paper.It has been shown that the modification results are affected by dosage of ACA, pulp properties and grinding behavior;the crushing mechanic force and its effect caused during grinding have some intensifying action to surface modification.The chance of physical properties of GCC before and after surface modification represents favorable modification effect.It is proved that ACA had been firmly adsorbed in the surface of GCC by infrared spectra.