| POS | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|
| 1 | Jamaica |  JAM | 45.01 Q | |
| 2 | Germany |  GER | 45.69 Q | |
| 3 | Japan |  JPN | 46.91 q | |
| 4 | South Africa |  RSA | 47.16 q | |
| 5 | Algeria |  ALG | 47.89 | |
| 6 | Chinese Taipei |  TPE | 48.39 | |
| PR of China Youth |  CHN | DQ |