Abstract: ［Abstract］Objective　To analyze the prevalence of iodine nutrition KAP of boarding school-age children in Wa nationality and its influencing factors in Shuangjiang county of Yunnan，then provide scientific evidence for the Wa nationality children to set up a healthy lifestyle．Methods　Systematic random sampling method was used to select 650 boarding school-age children from 10 primary schools in ShuangJiang county， and their condition of iodine nutrition KAP was estimated by KAP questionnaire. Results　The boys mastered as much iodine nutrition knowledge as the girls（P＞0.05）．High grade pupils mastered more iodine nutrition knowledge than low grade pupils （P＜0.05）．There was no sexual differences in actively iodine supplementation （P＞0.05）．High grade pupils supplemented iodine more actively than low grade pupils （P＜0.05）．Conclusion　The present situation of nutrition KAP among boarding school-age children in Wa nationality is serious， more ways of health education on iodine nutrition are required for these children.