Including, the team of chronic purulent maxillary sinusitis patients with eustachian tube dysfunction is 83%, it's higher the team of acute purulent maxillary sinusitis 53% (p < 0.05), the children that are under 7 years old that be eustachian tube dysfunction is 70.2%, it's higher than the team of over 7 years old is 47.7% (p < 0.05).