Abstract: ObjectiveTo observe the CD health(CDH,SeLEN)capsule's improve effect to low immunity population.T lymphocyte subg roup.By strictfield quantity control,the observation object,the volunteers with LYM<1200/μl,after one course of treatment,measuring the T lymphocyte by flow cytometer.The results showed that the effect that CDH improve lowimmunity people's lymphocyte,CD₃⁺ and CD₄⁺ was very obvious(P<0.01),average closed to 50%.There was 82.5% increased CD₄⁺ >40/μl,and 7 cases.CD₄⁺>200/Ll,and 6 cases increased both CD₄⁺ and CD₄⁺/CD₈⁺(>0.2),the effect rate was 32.5%.This prove that CDH has improve effect on CD₄⁺,stimulates immunity response function and streng thens the resistibility against pandmic.