From four aspects,the status about emergency monitoring system of sudden environmental event in Shanghai is introduced, such as organization and its working and management, used technologies and methods,hardware depositions and monitoring abilities, personnel depositions and their trainings and drillings, and so on. Then, a thought is advanced to improve the emergency monitoring system in Shanghai, including building a united emergency monitoring net, accelerating new technologies' researches and methods'standardization, strengthening equipments'depositions and their managements,accelerating building of emergency monitoring teams, building and improving technology supporting platform and strengthening logistic guarantee.