The results revealed that the numbers of CD4 T cells, CD8 T cells, type 1 regulatory T (Tr1) cells, induced regulatory T (iTreg) cells, follicular T-helper (Tfh) cells, gamma-delta T cells, Th17 cells, and other immune cells, including B cells, monocytes, natural killer (NK) cells and neutrophils, significantly differed between ICH patients and HTN controls (P<0.05). The gene discussed is CD8A; the disease is hypertensive disorder.