To observe the effect of tetrandrine (Tet) eye drops of different concentrations on corneal graft and on allograft rejection in rats. · METHODS: Models of allograft rejection were set up in 64 SD rats and they were then randomly divided into 3, 5, 10g/L tetrandrine eye drops-treated and control groups. At different times postoperatively, neovascularization and inflammation of corneal graft were observed using slit-lamp microscopy, HE staining, light microscopy and microphoto-analysis. · RESULTS: The graft was infiltrated mainly with lymphocytes and mononuclear-macrophages. Corneal neovascularization and inflammation were significantly inhibited in the 5g/L Tet-treated group (P <0.05), compared with control group on day 7, 14, 21, 28 postoperatively. · CONCLUSION: Corneal edema and corneal epithelial bubble appear when the graft is treated with tetrandrine of higher concentration (10g/L), but 5g/L Tet eye drops significantly inhibit corneal allograft rejection in rats without serious side-effects.