To study the effect of Yifei Jianpi Granule on lung function and immune function in elderly patients with COPD(feipiqixu).Methods:Selected 110 cases elderly patients with COPD to average divided in control group and observation group.The control group used routine treatment and observation group used Yifei Jianpi Granule on the basis of control group.Observed and compared the lung function、immune function、TCM syndrome scoring and effect in the two groups after 3 courses.Results: The PEF、FEV1、FEV1/FVC was no significant difference between two groups before treatment(P>0.05) and they had improved after treatment.The lung function after treatment in observation group was better than that in control group.It had significant difference between two groups(P<0.05).The CD3+、CD4+/CD8+、IgA、IgM was no significant difference between two groups before treatment (P>0.05).The CD3+、IgA、IgM、CD4+/CD8+ increased in observation group after treatment.The immune function after treatment in observation group was better than that in control group(P<0.05).It had significant difference.The TCM syndrome scoring in observa-tion group was lower than that in control group(P<0.05) and the total effective rate of observation group was higher than that in control group（89.09% VS 65.45%）(P<0.05).The difference was statistically significant.Conclusion: Yifei Jianpi Granule can resolve clinical symptoms and improve lung function,immune function and the effect in elderly patients with COPD(feipiqixu).It is valuable to advocate in clinic.