Abstract: Objective To investigate the iodine content in drinking water and the iodine nutrition level of different landforms and explore the iodine nutrition status in after iodized salt intervention in different landforms to provide scientific basis for the development of prevention strategies to iodine deficiency disorders. Methods The county was divided into five sampling sections according to azimuth (east, west, south, north and center), one town was randomly chosen in every position of the five. Two mountainous townships were respectively randomly chosen in the western and northern, two hilly townships were respectively randomly chosen in the southern and central, one lfat country townships was randomly chosen in the eastern to investigate and analyze the iodine level in drinking water. Salt iodine level, 8-10 year-old children’s urinary iodine level and goiter in the mountains, hills, falt country three landforms were examined. Results Iodine content in the drinking water were low, the salt iodine content was slightly higher than the current standards edible salt iodine content, children’s urinary iodine was at an more appropriate level, children’s goiter were conformed with the national “eliminate the iodine deficiency disorders standards”in mountains, hills and plains. Iodine contents in water were compared among different landforms, the difference was statistically signiifcant (HC=80.37, P<0.01). Salt iodine level was compared among different landforms, the difference was not statistically signiifcant (HC=0.24, P>0.05). Children’s urinary iodine level was compared among different landforms, the difference was not statistically signiifcant (HC=1.54, P>0.05). Children’s goiter rate was compared among different landforms, the difference was not statistically signiifcant (χ2=0.22, P>0.05). Conclusion Children’s iodine nutrition is at an more appropriate level in the current after Iodine intervention in Yi county, however, iodine contents are very low in drinking water in different landforms in Yi county. In order to safeguard the supply of residents iodine nutrition, we should continue to take iodized salt intervention based integrated interventions.

Key words: different landscapes, water iodine, salt iodine, urinary iodine, goiter