Universal salt iodination (USI) is global policy for eliminating iodine deficiency disorder (IDI), and the content of iodine salt was 30-80 ppm. Survey 2003 show that 35% urine iodine excretion (UIE) of school children is was high, more than 300 µg/L, survey 2004 in Grobogan district in central Java by Departnebt of Health show that UIE is was high to. The objective of the study is to conduct …