Effects of additive on the desulphurization characteristics of wastes were studied by the high temperature tube reactor and the KZDL-4M sulfur analyzer. The results show that after Ba(OH)2 and Fe2O3 is added into experimental wastes respectively, sulfur capture ability of experimental wastes increase effectively. MnCO3 can only improve sulfur capture ability of experimental wastes a little or even little. Suitable additive is a useful way to improve sulfur capture ability of wastes. However, different additive affects sulfur capture ability of wastes differently, three kinds of additive can be sorted as Ba(OH)2＞Fe2O3＞MnCO3.