Abstract: Objective To analyze the relationship between the dietary intake of sodium and potassium and hypertension among residents aged 18 years and above in Zhongshan City. Method Multistage cluster random sampling method was used to select residents aged 18 years and above from 400 households in 5 urban districts in Zhongshan. A questionnaire survey was conducted for collecting the basic information of the respondents， prevalence of hypertension， and intake and frequency of various types of food in one year. Descriptive epidemiological analysis was used to analyze the survey results. Multivariate logistic regression analysis was used to analyze the relationship between hypertension and sodium-potassium ratio. Results A total of 984 residents aged 18 and over in Zhongshan City were investigated， including 463 males （47.1%） and 521 females （52.9%）. The prevalence of hypertension was 8.2% （81/984）. The median intakes of the sodium and potassium were 2 501.5 （2 265.7-2 988.8） mg/day and 1 962.4 （1 313.6-2 775.6） mg/day， respectively. Of the residents， 93.6% had dietary sodium intake exceeding the recommended adequate intake （AI）， while 52.4% consumed dietary potassium below the recommended AI. The main resources of dietary sodium were edible salt （63.4%）， and then followed by livestock and poultry meat （8.8%）， and aquatic products （8.3%）. The resources of dietary potassium were cereals （20.9%）， vegetables （17.4%）， and livestock and poultry meat （15.5%）. Logistic regression analysis showed that， if the dietary sodium potassium ratio increased by 1 unit， the risk of hypertension increased 0.341 time （OR＝1.341）. Conclusion The dietary intake of sodium was slightly high and that of potassium was slightly low in the residents aged 18 years and above in Zhongshan. The dietary sodium potassium ratio increased the risk of hypertension.It is necessary to intensify health education on nutrition and to advocate low sodium and high potassium diet.