Effects of concentration(0~80 mmol L^-1) and pH(2.5~7.0) of the solution of tartrate,a simulative rhizo spheric exudate on adsorption and specific activity of acid phosphatase on goethite,kaolinite,and colloids in yellow brown soil and latosol were studied.Results suggest that the adsorption of enzyme on soil colloids and minerals exhibited a sharp downfall (0~5 mmol L^-1),which was soon leveled off with rising tartrate concentration from 0 to 80 mmol L^-1,The effect of tartrate concen tration on enzyme adsorption was the most remarkable (the adsorption percentage reduced from 96.2% in referenced system to 33.7% in 80 mmol L^-1 tartrate system) on goethite,but much lower (the adsorption percentage reduced from 76.3%~60.6% to 56.2%~41.6% in 80 mmol L^-1 tartrate system) on soil colloids composed of phyllo aluminosilicate mineral and kaolinite.The pH value triggering the maximum adsorption of enzyme was on the acid side of the IEP of the enzyme,which may probably be related to the change induced by tartrate in electric charge property of the minerals.In the tartrate system,specific activity of the enzyme was much higher on goethite than on the colloids.The most proper specific activity point of the enzyme did not vary much with the type of colloid.