0bjective: Research the Eustachian tube function in children with purulent maxillary sinusitisSubjects and methods: Prospetive study, with 91 patients that be from 6 to 15 years old, have been diagnosis for the purulent maxillary sinusitis at the ENT examination at the 1st children's hospital in the term that is from September 1, 2006 to April 30, 2007.