Abstract: This paper analysed the epidemic charactor of meningitis menignococcal around using meningococcal polysecchaaride vaccine group A.Results showed that using meningococcal polyseccharide vaccine group A has broken the epidemic charactor,greatly reduced the morbidity,cut the second peak of age specific morbidity.The disparity of incidence between urban and rural have been getting small,but the seasonal peak has not become different.The surveillance of serologly and meningococcal carriage indicated there has been a significance negative crrelation between the meningitis mening ococcal morbidity and BA antibody positive rate or GMT,a significance positive correlation between the meningit is meningococcal morbidity and meningococcal group A carriage rate too.The abov-ementione will provide certain scientific basis for epidemiological monitoring and forecasting of meningitis meningococcalafter using meningococcal polyseccharide vaccine group A.