Purpose. To report a long-term trend of surgical results of phacoemulsification performed by residents in a teaching hospital. Methods. This study analyzed 1,409 consecutive cases of phacoemulsification performed by residents under a single supervisor from July 2005 to March 2021. The 15.75-year period was divided into seven equal intervals for time-trend analysis. Main Outcome Measures. Rates of completion and complications were collected to assess the surgical results. Results. The overall completion rate was 60.5 (852/1409), and the intraoperative complication rate was 14.5 (204/1409). The completion rates from the first to the seventh interval were 44.7, 54.2, 60.6, 50.6, 65.1, 72.5, and 81.8, respectively. The completion rate improved significantly with time, mainly in the steps of anterior capsulorhexis and nucleus emulsification. The intraoperative complication rates from the first to the seventh interval were 27.4, 20.4, 14.0, 11.8, 8.2, 9.6, and 7.3, respectively. The complication rate also decreased significantly with time, mainly in the steps of anterior capsulorhexis, nucleus emulsification, and cortex removal. The major complications included anterior capsulorhexis tear (n=95), vitreous loss (n=40), iris damage or prolapse (n=36), and posterior capsule tear without vitreous loss (n=29). There was a significant improvement of surgical results with the level of residency in the completion rate but not in the complication rate. Conclusions. With a long-term evolution in the surgical training curriculum, it is possible to reach a goal of both higher completion and lower complication rates of resident-performed phacoemulsification.