By investigating the influences of pH value，urea and inorganic salts on the adsorption property of sodium
lignosulfonate (SL) on calcium carbonate (CaCO₃)，it is found that the electrostatic interaction and the hydro-gen bondingare not the main adsorption driving forces of SL adsorption on CaCO₃ surface，and that the salts with strong complexation ability as well as the blocking of some carboxyl groups of SL with lithium chloride may decrease the adsorption capacity of SL，which means that the complexation between the carboxyl of SL and CaCO₃ is the main adsorption driving force． Moreover，by using carboxymethylated lignin (CAL) with high carboxyl content (2. 59mmol/g) as a sacrificial agent in tertiary oil recovery，it is found that CAL is of outstanding sacrificial effect even at low mass concentration，with a maximum sacrificial effect value being up to 95. 15%; and that both CAL and SL possess good compounding effect with sodium dodecyl benzene sulfonate．