Subject and method: Descriptive study by evaluate pre-treatment clinical characteristics and cephalometric radiography of 69 class II malocclusion skeletal with extraction premolars patients (hypodivergent group had 12 patients, hyperdivergent group had 27 patients, normodivergent group had 30 patients) at Department of Orthodontics of Ha Noi Central Odonto - Stomatology Hospital to September 2022 were recuited.