AIM:To study the effect on high myopia accompanied with cataract treated by phacoemulsification and implantation of the low dimensionality posterior chamber intraocular lens(IOL).METHODS:Eighty cases 100 eyes of high myopia accompanied with cataract whose mean axis oculi was 30.55mm received phacoemulsification and IOL implantation.We used sclera tunnel incision and phacoemulsification debulk.Preoperative axial length,preoperative visual acuity and postoperative visual acuity were recorded.Intraoperative and postoperative complications were observed.The follow-up time was from 3 to 12 months.RESULTS:There were 51 eyes(51.0%)whose best-corrected visual acuity exceeded 0.5 three months postoperatively.The operative complications were the rupture of posterior capsule 2 eyes,dislocation of lens 2 eyes.The postoperative complications were corneal endothelial edema 9 eyes,after cataract 2 eyes,retinal detachment 1 eye.CONCLUSION:Phacoemulsification has many merits such as small incision and low astigmia.Phacoemulsification and implantation of the low dimensionality posterior chamber IOL used to treat high myopia accompanied with cataract can prevent complication and recover the visual function.