To investigate the correlation between the common pediatric respiratory diseases and human physical, emotional and intellectual biorhythm. Methods: Patients with common pediatric respiratory diseases of 2 018 cases were collected and the onset dates were examined to figure out they were in which biorhythm-climax, critical or low tide period. And then the periods of onset were determined. And then Chi square test and circular distribution analysis were performed. Therefore, the correlation between the common pediatric respiratory diseases and human physical, emotional and intellectual biorhythm was figured out. Results: There was no significant correlation between the two items. The onset had a uniform distribution. Conclusion: There is no significant correlation between the common respiratory diseases and biorhythm and children.