Objective: Delayed or impaired reendothelialization is a major cause of stent thrombosis in the interventional treatment of coronary heart disease. T cells are involved in neointima formation of injured arteries. However, the regulated mechanism of reendothelialization and the role of CD8 T cell in reendothelialization are unclear. Methods and Results: Immunofluorescence staining showed that CD8 positive cells were increased in wire injured femoral artery of mice. On day 21 after injury, elastin staining showed that knockout of CD8 (CD8(-/-)) significantly increased intimal thickness and a ratio of intima to media by 1.8 folds and 1.9 folds respectively in injured arteries. Evans blue staining showed that knockout of CD8 delayed the reendothelialization area on day 7 after injury (18.8+/-0.5% versus 42.1+/-5.6%, p<0.05). In vitro, a migration assay revealed that CD8(-/-) T cells co-cultured with WT macrophages significantly inhibited the migration of the endothelial cells (ECs); compared to CD4(+) T cells, and CD8(+) T cells could promote the ECs migration. Furthermore, real-time PCR analysis showed that knockout of CD8 increased the level of tumor necrosis factor a (TNF-alpha) in injured arteries and cytometric bead cytokine array showed that TNF-alpha was elevated in cultured CD8(-/-) T cells. Finally, a wound-healing assay showed that recombinant TNF-alpha significantly inhibited the migration of ECs. Conclusion: Our study suggested that CD8(+) T cells could promote the reendothelialization and inhibit the neointima formation after the artery wire injury, and this effect is at least partly dependent on decreasing TNF-alpha production promoting ECs migration.