See main article: Athletics at the 2008 Summer Paralympics.
The Men's 400m T12 had its first round held on September 11, beginning at 17:50. The Semifinals were held on September 12, at 18:20 and the Final was held on September 13 at 19:50.
| Place | width=250 | Athlete ! | width=100 | Round 1 ! | width=100 | Semifinals ! | width=100 | Final | |||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 50.47 Q | 50.11 Q | 49.45 | ||||||||
| 2 | 49.81 Q | 50.48 q | 50.15 | ||||||||
| 3 | 51.03 Q | 50.87 q | 50.20 | ||||||||
| 4 | 49.75 Q | 50.73 Q | DSQ | ||||||||
| 5 | 51.12 q | 51.07 | |||||||||
| 6 | 50.50 q | 51.20 | |||||||||
| 7 | 51.04 q | 51.39 | |||||||||
| 8 | 50.12 q | DNF | |||||||||
| 9 | 51.40 | ||||||||||
| 10 | 51.67 | ||||||||||
| 11 | 52.11 | ||||||||||
| 12 | 52.87 | ||||||||||
| 13 | 56.14 | ||||||||||
| DNF | |||||||||||