Objective To observe the clinical effect of treating children’s recurrent respiratory tract infections（RRTI） by acupoint application with herbal ion penetration therapy in dog days. Methods This intervention was designed as a self control trial. It polycentricly selected 120 cases of child patients who met the inclusion criteria and treated them with the external treatment. Followed up for 1 year. Before and after the treatment， it was to observe the disease score， the frequency of respiratory tract infection， the acute course， ways of drug delivery， signs and symptoms of TCM， and to detect the salivary sIgA. Results ① The total effective rate was 65. 3%； ② The disease score significantly decreased after treatment（P<0.001）； ③ After treatment， the disease score， the frequency， and the acute course declined（P<0.001）； in the infection period， average number of days of treatment significantly reduced（P<0.001） and ways of drug delivery changed from the intravenous administration to oral medication， the difference was particularly significant（P<0.001）； ④ Sweat symptoms improved significantly（P<0.001）； ⑤ It can persistently rise the salivary sIgA in about half a year. Conclusion Acupoint application therapy for children’s RRTI in dog days is an effective clinical treatment in the prevention and treatment of children’s RRTI， while it can persistently rise the salivary sIgA in just about half a year.