Abstract: In order to learn the epidemic feature of infectious disease and the effect of preventive measures after flood in Jianxi Province, analysis of incidence rate (Per 100,000) of A and B notifiable infectious disease in 1999 was carried out. The total incidence rate was 253.22/10 6 compared with that in 1998, 12.70% was increased. The increasing incidence rates of the flood related infectious diseases were hepatitis A and E, dysentery and hephalitis. Leptospirosis was prevented significantly, the incidence rate was decreased to the lowest level in 1990's.