Objective To observe the serum inflammatory factors level in patients with obstructive sleep apnea syndrome (OSAS) and coronary heart disease (CHD).Methods Venous blood was collected at 6 AM from 53 natiems with both OSAS and CHD and 37 simple snorers following a full night polysomnography (PSG) test.Serum MMP-9、TIMP-1 test were conducted.Results MMP-9,TIMP-1 level in patients with OSAS and CHD was significantiv higher than that of the simple snorers (P<0.05).Conclusion serum MMP-9 and TIMP-1 level increase in patients with OSAS and CHD.It is suggested that elevated level of serum MMP-9 and TIMP-1 might play an important role in the development of CHD in patients with OSAS.