Abstract: Objective To investigate the current status of dietary quality among adult residents in Zhangjiagang City,and to identify existing problems and potential health risks. Methods From 2020 to 2021,a multi-stage stratified probability sampling in proportion to population was used to select 200 households with 600 people from 4 communities in the urban area of Zhangjiagang City and 3 communities in each of 2 townships. Dietary data were collected by 24-hour dietary review method and household weighing accounting method for 3 consecutive days. The Chinese healthy diet index（CHDI） was used to analyze the dietary quality of different populations. Results The average total score of CHDI among adult residents in Zhangjiagang City was （58.9±9.2）points, with significantly lower scores among residents aged 60 and above compared to other age groups,and the difference was statistically significant（P<0.05）. The proportions of people who reached or exceeded the recommended intake of various foods was 86.1% for refined grains,52.2% for meat and eggs,44.3% for fish and shrimp,22.6% for dark green and orange vegetables,15.5% for total vegetables,7.5% for fruits,5.2% for whole grains and mixed beans and potatoes,3.3% for dairy,and 2.2% for soybeans. The scores of food types,refined grains,total vegetables,dark green and orange vegetables,fruits（in female）,milk,meat and egg（in male）,sodium, energy supply ratio for pure calories food were statistically significant differences among different age groups（H=6.506-32.531,all P<0.05）. The fruit scores of female in different regions and age groups were significantly higher than those of male（H=-3.889--2.303,all P<0.05）. The scores of women's dairy products and men's soybean products showed statistically significant differences between different regions（H=-2.730--1.991,all P<0.05）. Conclusion The dietary quality of adult residents in Zhangjiagang City is inappropriate,and the intakes of fruits,whole grains,dry beans and potatoes,milk and soybeans were seriously insufficient in the whole population. The dietary problems of the elderly are more prominent. It is recommended to strengthen targeted education and dietary guidance for different groups of people.

Key words: Adult residents, Dietary survey, China healthy diet index, Food