AIM:To observe the alteration of intraocular pressure (IOP) after laser peripheral iridotomy in different total powers. METHODS: YAG laser peripheral iridotomy were performed on 68 cases (136 eyes) with narrow angle anatomically. The IOP was taken down before the procedure and 60 minutes after the procedure,and so was the total power in the procedure.The cases were divided into 3 groups(high/middle/low power) according to the total power in the procedure,then the numbers were recorded of postoperative IOP increasing lower than 5mmHg and higher than 5mmHg in each group.  RESULTS:There was significant statistical difference among low power group and the other two groups in numbers of postoperative IOP increasing (P＜0.05). There was no significant statistical difference between the middle power group and the high power group(P＞0.05). CONCLUSION:In the cases of YAG laser peripheral iridotomy, the more lower the total power,the more lower the risk of IOP increasing after the procedue.But, there is no correlation between the total power and the risk of IOP increasing after the procedue in the case with total power above 44mJ.