It is still controversial whether total splenectomy on adult animals would affect their immune function. In this study, total splenectomy and different kinds of splenic preservation operations including splenorrhaphy, partial splenectomy and spleen autotransplantation were performed on adult rats after the porta of the spleen of the rats was artificially ruptured and the splenic artery ligated.In the 4th month after the operations, the hemolysin antibody and the de-layed-type hypersensitivity reaction were determined in the rats. It was found that no significant difference occurred in the hemolysin antibody and the delayed type hypersensitivity reaction among the rats of the control group, the group with total splenectomy, and the groups with different kinds of splenic preservation operations.