Objectives To investigate whether thromboxane receptor antagonist S18886 inhibits infiltrating macrophages to vessel wall and influence the morphology of atherosclerotic plaque; The effective of S18886 compared to clopidegrol on the development of atherosclerosis, accumulation of lipid- filled macropha-ges in apoE null mice. Methods All mice were done cuffed common carotid artery and fed a Western-type atherogenic diet for 6 weeks from the day of surgery, at same time the therapy group mice were gavaged S18886 5 mg/Kg/day and clopidegrol respec- tively, the same volume water were gavaged as the placebo group. Results profound inhibition of lesion area growth after cuff of the right common carotid artery in mice with 5 mg/kg of S18886, markdely reduce intima to media ratio and intima to total wall area compare with clopidegrol or blank group; Macrophage infiltration into sites of arterial plaque was also markedly attenuated by ICAM-1 deficiency in the S18886 group, whereas inside the arterial wall plaque of placebo apoE null mice α-smooth muscle actin markedly attenuated. Treatment with 25 mg/kg/day clopidegrol reduced the level of ICAM-1 stai ning, both S18886 and clopidegrol didn’t influence the α-smooth muscle actin inside plaque. Conclusions It was considered that the novel anti-thrombotic drug significant reduce macrophage infiltration in the sites of arterial plaque by ICAM-1 deficiency, S18886 not only reduce the size, but also stabilized the plaque. Objectives To investigate whether thromboxane receptor antagonist S18886 inhibits infiltrating macrophages to vessel wall and influence the morphology of atherosclerotic plaque; The effective of S18886 compared to clopidegrol on the development of atherosclerosis, accumulation of lipid-filled macropha-ges in apoE null mice. Methods All mice were done cuffed common carotid artery and fed a Western-type atherogenic diet for 6 weeks from the day of surgery, at same time the therapy group mice were gavaged S18886 5 mg / Kg / day and clopidegrol respecively, the same volume water Results profound inhibition of lesion area growth after cuff of the right common carotid artery in mice with 5 mg / kg of S18886, markdely reduce intima to media ratio and intima to total wall area compare with clopidegrol or blank group ; Macrophage infiltration into sites of arterial plaque was also markedly attenuated by ICAM-1 deficiency in the S18886 group, while inside the ar terial wall plaque of placebo apoE null mice α-smooth muscle actin markedly attenuated. Treatment with 25 mg / kg / day clopidegrol reduced the level of ICAM-1 stai ning, both S18886 and clopidegrol did not influence the α-smooth muscle actin inside Conclusions It was considered that the novel anti-thrombotic drug significant reduce macrophage infiltration in the sites of arterial plaque by ICAM-1 deficiency, S18886 not only reduce the size, but also stabilized the plaque.