| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:25.69 | UCSC Spring Start-up | 2026-04-25 |
| 100m Backstroke | 1:21.44 | UCSC February Invitational | 2026-02-21 |
| 100m Breaststroke | 1:34.26 | UCSC Grand Prix | 2026-01-30 |
| 100m Butterfly | 1:21.56 | Winter Provincial Trials | 2026-03-06 |
| 100m Freestyle | 1:12.59 | UCSC Spring Start-up | 2026-04-25 |
| 100m Freestyle | 1:09.69 | UCSC February Invitational | 2026-02-21 |
| 100m IM | 1:19.41 | UCSC February Invitational | 2026-02-21 |
| 200m Breaststroke | 3:13.71 | UCSC February Invitational | 2026-02-21 |
| 200m Butterfly | 3:07.21 | UCSC Grand Prix | 2026-01-30 |
| 200m Freestyle | 2:38.51 | UCSC Grand Prix | 2026-01-30 |
| 200m IM | 2:57.95 | UCSC Spring Start-up | 2026-04-25 |
| 200m IM | 2:54.38 | Winter Provincial Trials | 2026-03-06 |
| 400m Freestyle | 5:38.46 | UCSC Holiday Classic | 2025-12-13 |
| 400m IM | 5:57.21 | UCSC February Invitational | 2026-02-21 |
| 50m Backstroke | 39.01 | Winter Provincial Trials | 2026-03-06 |
| 50m Breaststroke | 46.81 | UCSC Spring Start-up | 2026-04-25 |
| 50m Breaststroke | 44.02 | UCSC Holiday Classic | 2025-12-13 |
| 50m Butterfly | 36.41 | UCSC Spring Start-up | 2026-04-25 |
| 50m Butterfly | 40.41 | UCSC Fall Back Invitational | 2025-11-07 |
| 50m Freestyle | 33.85 | UCSC Spring Start-up | 2026-04-25 |
| 50m Freestyle | 32.83 | Winter Provincial Trials | 2026-03-06 |
Li, Jiajun's top personal bests include 100m Backstroke (1:25.69), 100m Backstroke (1:21.44), 100m Breaststroke (1:34.26), 100m Butterfly (1:21.56), 100m Freestyle (1:12.59).
Li, Jiajun swims for Calgary Swimming.
Li, Jiajun has competed in 8 meets.