Integrated water resource security evaluation has been a hot topic in the research of water resource management in recent years. The TOPSIS based grey correlation integrated evaluation model of water resource security was established and applied to the case study of Beijing City from 1996 to 2006. It was demonstrated that the grey relative closeness degrees of water resource security to the positive ideal solution were quite low，with the least one of 0. 350 in 1999 and the largest one of 0. 507 in 2006，which implied that the water resource of Beijing City was facing severer challenges, although its general situation had been improving slowly during the concerned time. The analysis of water resource security indices indicated that the supply insufficiency of water resource was increasing, while the values of state and response indices were improving gradually. Finally, suggestions were proposed to improve the water resource security status of Beijing according to the evaluation results,which will lay solid foundation for the urban water resource management and regulation.