OBJECTIVE To study on the influence of human papilloma virus(HPV) type on the clinical course of juvenile onset recurrent respiratory papillomatosis(JORRP).METHODS Fresh tumor specimens of 38 patients were collected and the HPV type of the specimens was detected by flow fluorescent hybridization method.According to the results,children were divided into HPV6 and HPVll positive groups.The clinical data of the two groups were compared.RESULTS Among 38 children with recurrent respiratory papillomatosis,21(55.2％) were infected with HPV6,14(36.8％) were infected with HPVll,and 3(7.9％) were negative for HPV 6 or HPV 11.The proportion of aggressive cases in HPV6 and HPV11 groups were similar.The age of onset,preoperative clinical symptom score,number of anatomic locations,anatomic Derkay/Coltrera score and Dikkers score were significant different between the two groups (P=0.002,0.040,0.023,0.001,0.005,respectively).CONCLUSION JORRP patients with HPV11 infection had the features of smaller onset age,more severe clinical symptoms and broader invasion compared with HPV6 infection.