Scientific research Effect of letrozole in inducing ovulation, analysis of clinical outcomes of microstimulation regimen in low-response population, analysis of treatment outcomes of adding recombinant LH during ovulation induction, analysis of treatment outcomes of genetically modified FSH alone and combined use of recombinant FSH and HMG, analysis of malformation rate in offspring born after IVF treatment, Analysis of the incidence and related factors of multiple pregnancies in IVF, clinical outcomes of endometrial hyperplasia, Case report on IVF outcomes in CAH patients Academic part-time job Editorial member of the first editorial board of the Chinese Journal of Reproduction and Contraception Member of the Standing Committee of the First Committee of the Professional Committee of Obstetrics and Gynecology of the Beijing Women's Doctors Association Leader of the Reproductive Studies Group of the Professional Committee of Obstetrics and Gynecology of the Beijing Women's Doctors Association Deputy Leader of the Practical Reproductive Endocrinology Group of the Reproductive Medicine Professional Committee of the Chinese Medical Doctor Association t Member of the Reproductive Immunology Professional Committee of the Maternal and Child Health Research Association Member of the Reproductive Medicine Professional Committee of the China Association for the Promotion of International Medical Exchanges Member of the 4th and 5th Psychosomatic Medicine Professional Committee of the China Mental Health Association