In order to investigate the relationship between pathogeneses-related proteins（PRs） genes and plant resistance against Peronospora parasitica, four PRs genes expression were examined after inoculation with Peronospora parasitica in resistant Chinese cabbage variety by using real-time quantitative PCR（RT-PCR） technology. Results showed that PR-4 gene and class Ⅳ chitinase genes expression were significantly induced by inoculation treat-ment, β-1, 3-glucanase gene expression showed two single peaks, but PR-1 gene expression showed no change by inoculation treatment. PRs genes transcription in resistant variety showed they may play different roles in Chinese cabbage resistance against Peronospora parasitica.