The invention relates to a data storage method and system for a local area network real-time base, belonging to a local area network protection management system. According to the data storage method and the system, data which should be stored in a stand-alone real-time database ordinarily is dispersedly stored in multiple real-time databases according to some rule; the real-time base of one machine is used as a real-time backup base to store all data stored by the real-time databases in other running servers, and the real-time base of one machine is selected as a management machine of the real-time databases; the dispersed storing rule of data adopts a principle of load balancing; and thus, although the data is dispersedly stored in multiple real-time databases on the physics, a client side obtains the complete data of the whole system, and therefore the logic integrity is realized. When the real-time base of one or multiple machines breaks down due to some reason, the method and the system can recover the data in time.