Abstract: ObjectiveTo understand the effec of special immunity level of the high risk group to AIDS and the infection of sexually transmitted idsease(STD)of prevention.MethodsThe CD₄⁺ T cell and AIDS/STD antibody of sauna service people were determined by flow cell technique and serum aetilogy.ResultsThe hepatitis Bvirus(HBV)and syphilis ieptospira (USR)antibody carrying of sauna service people group with WBC<4.0×10⁹/L and lymphocyte(LYM)≥4.0×10⁹/L(P_av<0.01).There was high relation between CD₄⁺ number and HBV(r=0.698,P<0.05)).The former CD₄⁺ Tcell 451/μl obviously lower than the latter(560/μl P<0.05).But with ratio of CD₄⁺/CD₈⁺ and CD₄⁺ percentage,the former 2.49 and 35.9% were obviously higher than the latter(1.84 and 31.1%,P<0.05 and P<0.01).The HIV antibody of all sauna service were negative carry.ConclusionThe low immunity with sauna service people have relation with AIDS/STS infection,the ill sexual behavior acts as intermedia,and the function of cell immunity may be in stimulated condition.