To investigate the classification and distributed features of pediatrics and adolescent (under 19 years old)space-occupying lesions of the orbit(2575 cases) diagnosed by pathological or clinical at a Institute of orbital diseasesduring a 16-year period.Different kinds of orbital diseases were categorized.Vasculogenic(l156 cases,45%),peripheral nerve diseases(302 cases,12%),cystic(199 cases,7.7%),optic nerve and sheath tumors(181 cases,7%) and inflammation(159 cases,6.1%) were the top five lesions.