Objective To investigate the epidemiology of fatty liver,metabolic syndrome,and their relationgship in Sinopec Zhenhai Refining Chemical Company(ZRCC).Methods 9543 people for health examination were chosen to observe their data of general imformation,physical examination,biochemical parameter.Fatty liver was diagnosed according to two dimension ultrasound.Metabolic syndrome was diagnosed according to 2005 IDF criteria.Results Of 9543 people,1177 were diagnosed as fatty liver,and the prevalence of fatty live was 12.3%;1289 were diagnosed as metabolic syndrome,and the prevalence of metabolic syndrome was 13.6%.The prevalence of both was increased with aging(0.05).The prevalence of fatty liver in people with metabolic syndrome was higher than that in the control group,and the prevalence of metabolic syndrome in people with fatty liver was also higher than that in the control group.Conclusion The prevalence of fatty liver and metabolic syndrome were 12.3% and 13.6% respectively in ZRCC.Fatty liver is the accumulation of risk factors of metabolic syndrome.