Abstract: In May 2012, 11 echinococcosis-endemic counties in Ganzi Tibetan Autonomous Prefecture of Sichuan were chosen, and two primary schools were randomly selected in each county from urban and non-urban area. Serum anti-echinococcus IgG was detected by ELISA. Among 5 171 sampled children, the sero-positive rate was 0.8%（43/5 171）. The rate in males and females was 0.7%（17/2 538） and 1.0%（26/2 633）, respectively（χ2=1.581，P＞0.05）. The sero-positive rate in urban schools and non-urban schools was 0.7%（14/2 078） and 0.9%（29/3 093）, respectively（χ2=1.050, P＞0.05）. The positive rate in the minorities（1.0%, 41/4 273） was higher than that of the Han nationality （0.2%, 2/898）（χ2=4.884, P<0.05）. Compared with 2010, 2011, the total positive rate of children in 2012 declined significantly（χ2=112.945, P<0.01）.

Key words: Echinococcosis, Infection, Examination