Objectives Acupoint sticking in Dog-Days is one of Oriental medical prophylaxis to prevent winter diseases over the summer. The research has been conducted to evaluate the efficacy of Acupoint sticking in Dog-Days. Methods We visited one kindergarten in Dog-Days of 2011, and the subjects were 72 children (38 boys, 34 girls, $58.24{pm}12.28$ months, 37-105 months). 72 children were attached Socheongo to BL-13, BL-15, BL-17 for 4-6 hours. Exacerbating effect or non-improvement in respiratory symptoms before and after the treatment were nullified. Results 31 children (43.1%) have shown positive effect in Socheongo, with no significant differences among the groups. There were significant improvements in Socheongo group in frequency of having cold, duration and visits; duration under tonsillitis, frequency of having otitis media, duration and visits (P<0.05). Lung weak score also had significant decrease in the three times Socheongo group, from $11.27{pm}5.61$ to $9.90{pm}4.66$ (P=0.030). Side effects has been reported in Socheongo group; 7 erythema (9.7%), 2 heating (2.8%), 9 pruritis (12.5%), 2 vesicle (2.8%), 13 scar (18.1%). Conclusions Acupoint sticking in Dog-Days improves lung weak symptoms such as common cold, tonsilitis, and otitis media in children older than three years old, throughout the three times of the treatment. However, the ways to reduce the side effects are needed.