Objective To evaluate the changes in horizontal phoria and fusional function after phakic posterior chamber implantable contact lens （PPC-ICL） implantation for high myopia. Methods In this self controlled study， PPC-ICL implantation surgery was performed on 84 eyes of 42 high myopia patients. Far and near horizontal phoria， medial fusional range and lateral fusional range were calculated before surgery and 1 and 6 months after surgery. A variance analysis test of continuous measurement data was used for statistical analysis. Results Before surgery， far horizontal phoria was -4.33△±4.62△ and near horizontal phoria was -8.88△±6.74△. One and 6 months after surgery， it was -2.24△±3.33△ and -2.02△±2.93△ for far horizontal phoria and -4.95△±5.45△ and -3.55△±5.10△ for near horizontal phoria. All values decreased. The differences for far and near horizontal phoria were statistically significant （F=5.00， 9.53， P＜0.01）. One and 6 months after surgery， the far medial fusional range was 12.74△±3.52△ and 13.95△±4.01△ and the near medial fusional range was 14.36△±3.96△ and 16.79△±3.90△. These values were obviously larger than the 9.83△±2.68△ and 10.95△±3.28△ values before surgery. The differences were statistically significant （F=15.83， 25.96， P＜0.01）. One and 6 months after surgery， the far lateral fusional range was 8.05△±2.15△ and 7.74△±1.86△ and the near lateral fusional range was 15.29△±3.52△ and 14.64△±3.11△. These values were larger than the 7.36△±2.66△ and 13.43△±3.11△ before surgery. The difference in far range was not statistically significant （F=0.99， P＞0.05） while the difference in the near lateral fusional range was statistically significant （F=3.53， P＜0.05）. Conclusion Horizontal phoria and fusional range after PPC-ICL implantation obviously improved compared with the values before surgery and visual comfort also improved.