Objective To compare the serum cytokines and high-sensitive C-reactive protein (hs-CRP) in the post-stroke depression(PSD) and depression patients,and further study of the pathogenesis PSD and depression.Methods The levels of serum IL-1β,IL-6 and TNF-α in the PSD group(n=30),the depression group(n=30),the post-stroke non-depression group(n=30)and normal control group(n=30)were measured with enzymatic-linked immunosorbent assay(ELISA),and the levels of serum hs-CRP were measured by scatter rate nephelometryat for these four groups.Results The levels of serum IL-1β,IL-6,TNF-α and hs-CRP in the PSD group,the depression group,the the post-stroke non-depression group and the normal control group were respectively((137.23 ±8.12) pg/ml,(34.12±3.12) pg/ml,(64.62±6.11) pg/ml,(15.36±6.25) mg/L) ; ((133.21 ±7.56) pg/ml,(33.56±2.65) pg/ml,(62.95±5.66) pg/ml,(4.02± 1.21) mg/L) ; ((43.25 ±6.23) pg/ml,(16.12±2.60) pg/ml,(32.23±7.12) pg/ml,(14.88±7.23) mg/L) ; ((42.12±5.78) pg/ml,(15.32±3.23) pg/ml,(31.55±6.70) pg/ml,(3.68± 1.11)mg/L).The levels of serum IL-1β,IL-6 and TNF-αt in the PSD group and the depression group increased significantly than those in the the post-stroke non-depression group and the normal control group(P＜0.01).The levels of serum hs-CRP:PSD group ＞ post-stroke non-depression group ＞ depression group ＞ normal control group(P＜0.05).Conclusion The PSD and depression may have the same immune mechanism.