AIM:To explore the surgery techniques of phacoemulsification for treatment of microcoria cataract.METHODS:Ninety-eight cases (116 eyes) of microcoria cataract were firstly operated by using,intraocular lens positioning hook or iris restorer,capsular membrane shear,rearing iris surface organization membrane and any other methods to expand the pupil to 4-5mm,and completed phacoemulsification combined with intraocular lens surgery in capsular bag.RESULTS:Intraoperative 116 eyes (100%) expanded pupils to 4-5mm and successfully completed and phacoemulsification.The postoperative pupils recovered normal in 106 eyes (91.4%),of which 8 eyes(6.9%) had posterior capsule rupture,20 eyes (17.2%) had corneal edema which disappeared in 3-5 days,6 eyes (5.2%) had not intraocular lens implantation.CONCLUSION:Using intraocular lens positioning hook,capsular membrane shear and any other methods can simply and effectively expand the pupil without damaging,also maintaining the pupil circular postoperatively,and existing papillary light reaction.So phacoemulsification can successfully complete and preserve the pupil function at the same time.