Abstract: Objective To study influencing factors of hypertention in workers exposed to heat stress.Methods With cluster sampling,160 steel workers and rollers were selected as the exposure group and 114 workers without heat exposure as control group.The information on general situation and work environment were collected with questionnaire.All subjects acepted health examination including anthropometric characteristics (body height,weight,waistline),blood pressure,blood glucose,triglyceride and cholesterin.Results The prevalence rates of hypertension in the exposure guoup and control group were 25.00% and 12.28%.The rate was significantly higher in the exposure group (P<0.05).Hihg temperature,obesity,and smoking were risk factors for hypertension.Obesity was a risk factor in non-exposrure group (OR=19.330,P<0.05).Smoking and cholesterin were risk factors in exposure group (OR=16.29,2.99,P<0.05).The hypertension prevalence rates for exposed worker at the age of < 35,35-45 and >45 years old were 29.03%,21.33% and 26.08%,respectively.There was asignificant difference in hypertention prevalence between exposed and unexposed workers at the age of 35-45 years (P<0.05).Conclusion Heat exposure is an inducing factor for hypertention and could lead early occurrence of the disease.Smoking and cholesterin were cooperation factors in hypertension development.