AIM:To evaluate the stability using ultrasonic biomicroscope(UBM) in eyes having phacoemulsification with implantation of 2 types posterior chamber intraocular lens (PC-IOL). METHODS:The degree of PC-IOL decentration,tilt and anterior chamber depth(ACD) were measured by UBM，while locating the haptics and observing the relationships of haptics on uveal tissue. RESULTS:There was no significant change during the 1 month follow-up period in decentration or tilt in each group (P>0.05).There was no significant difference among the groups in IOL decentration or tilt at any time point (P>0.05).There was no significant change during the 1 month follow-up period in ACD in each group (P>005). There was significant difference among the groups in ACD at 1 week,1 month after surgery (P<0.05). CONCLUSION:The stability of 1-piece IOL in eyes was better than that of 3-piece IOL;UBM can locate the haptics and observe the relationships of haptics on uveal tissues better.