Objective  To investigate the change in the anterior chamber angle and to analyze its related factors of phakic posterior chamber implantable collamer lens （PPC-ICL） implantation. Methods  Twenty-six moderate and high myopic patients （45 eyes） who received PPC-ICL implants from March 2013 to April 2014 were included in this prospective study. The mean follow-up time was 4.3±3.2 months. Anterior chamber angle （ACA）， anterior chamber depth （ACD）， corneal curvature， and vault were measured with a Pentacam preoperatively and postoperatively. Corneal horizontal diameter and axial length （AL） were measured with IOLMaster. Visual acuity （VA）， spherical equivalent （SE） and intraocular pressure were recorded preoperatively and postoperatively. The data were analyzed with a matching t test， Wilcoxon signed rank test， Pearson correlation analysis， Spearman rank correlation and multiple regression analysis. Results  The ACAs at 3∶00 preoperatively and postoperatively were 43.23°±5.72° and 27.44°±5.24°. There was a significant difference between them（Z=-5.841， P＜0.01）. A positive correlation was found between the ACA change at 3∶00 and vault （r=0.556， P＜0.01） and preoperative ACA at 3∶00 （r=0.530， P＜0.01）. The correlation equation for postoperative ACA is ACApo=4.860-0.009 vault+0.621 ACApr （F=20.032， P＜0.01）. The ACAs at 9∶00 preoperatively and postoperatively were 42.40°±5.81° and 26.82°±4.73°. This is also significantly different （t=20.890， P＜0.01）. A positive correlation was also found between the ACA change at 9∶00 and vault （r=0.581， P＜0.01） and preoperative ACA at 9∶00 （r=0.626， P＜0.01）. The correlation equation for postoperative ACA is ACApo=5.767-0.008 vault+0.586 ACApr （F=24.775， P＜0.01）. Conclusion  The horizontal ACA narrowed significantly postoperatively. Preoperative ACA and vault were positively correlated with the change in ACA.