Objective To study the effect of Herbst appliance in the treatment of Class Ⅱ Division 2 malocclusion in young adults. Methods 35 cases with Class Ⅱ Division 2 malocclusion underwent the treatment with Herbst appliance and second phase of fixed orthodontic treatment in our hospital from July 2013 to July 2014 were selected. And the treatment effect was observed. Results ANB, U1/L1, OB, U6-Ptm decreased after treatment; L1/MP, SNB, MP/SN, L6/MP, U1/SN, L6-Ptm increased after treatment, but the SNA, OJ, U6/PP...