Among 63 with HAP (43 male and 20 female), 90.5% cases were suffered from ventilator - associated pneumonia; the average age was 66.3 ± 17.6 years; the average incubation period was 7±2.4 days; 12.7% cases had early incubation period and 87.3% cases had late incubation period; the average APACHE II score was 23.2± 3.0; 68.3% cases had APACHE II score > 21.