Purpose: Competency-based medical education has been the current trend of education, and milestones assessment is one of the means to practice it. We hereby shared our experience and preliminary results in applying reporting milestones in our postgraduate year (PGY) training program. Methods: We translated the English version of "reporting milestones" to Chinese one and built the electronic report worksheets on our web-system. Milestones assessments were conducted at the end of every month since August 2018. We analyzed the completion rate and the results of the assessments in the 2018 academic year by using IBM SPSS Statistics version 23. Results: The completion rate of milestones assessments was 96.7% (175/181), of which the most frequent unassessed subcompetencies were patient care (PC)-4 and PC-5 (both n = 9). The mean levels of the subcompetencies ranged from 3.5 to 4 on a scale of 1-5. Our PGY physicians demonstrated better in subcompetencies systems-based practice (SBP)-1, practice-based learning and improvement (PBLI)-1, and PBLI-3 (mean levels 4.0 ± 0.4, 4.0 ± 0.4, 4.0 ± 0.5, respectively), and worse in subcompetence SBP-3 (mean levels 3.5 ± 0.6) (p < 0.05 by ANOVA). The progress of all subcompetencies between the first and third months of rotation course was insignificant. Conclusions: We accomplished the reporting milestones assessments in our hospital. Our experience in implementing milestones can be as a reference for other hospitals. The learning outcomes from milestones assessments may be helpful to improve our PGY program.