Objective To analyse the results of iodine deficiency disorders(IDD)monitoring in Yuzhong District,Chongqing from 2018 to 2022,so as to provide evidence for the implementation of long-term scientific iodine supplementation strategy.Methods In accordance with the requirements of the"National Iodine Deficiency Disease Monitoring Programme(2016 edition)",at least 40 children aged 8-10 years old and 20 pregnant women were selected from each street according to the five directions of east,west,south,north and centre every year.From 2018 to 2022,a total of 1 090 children and 500 pregnant women were selected.Salt iodine content,urine iodine content and thyroid volume in children were detected,and salt iodine content and urine iodine content in pregnant women were detected.Results From 2018 to 2022,the medians of salt iodine were 25.90,26.20,24.19,25.00 and 28.11 mg/kg,respectively,with statistically significant difference(P<0.01),and the consumption rates of qualified iodized salt were 93.46%,94.06%,97.52%,98.10% and 95.83%,respectively,with statistically significant difference(P<0.05).The medians of urine iodine in 5 years of children were 239.47,360.00,213.39,254.00 and 266.55 μg/L,respectively,all higher than the appropriate level of iodine;the medians of urine iodine of pregnant women were 178.50,158.00,168.23,192.50,173 µg/L,respectively,all at the appropriate level,the goiter rates of children in 2018,2019 and 2021 were 3.17%,2.73%,0.93%,respectively,with no statistically significant difference(P>0.05).Conclusion All indicators of IDD prevention and control in Yuzhong District of Chongqing have reached the standard of eliminating IDD for 5 consecutive years.However,it is still necessary to strengthen the supervision of iodized salt market and the publicity and education of IDD prevention and control,especially for the health promotion of children's scientific iodine supplement.