Real-time active database systems are systems that need the logical consistency of computation results and the timing constraint the result was produced for the correctness of the system. Especially, real -time systems are generally highly interactive with their environment, reacting to stimuli in the environment. And a wealth of active database models has been proposed, and several major prototypes have been produced. However, no uniform method for specifying the rule and each manager of active database system in de sign has yet been proposed within the real -time research community: for an example, real -time object model.This paper presents an architecture of an real -time active database system using time -triggered message -triggered object with incorporating active functionality and real -time constraints into an active database kernel in layered architecture. Also this paper shows how real -time objects are designed to a manager as a module of active database and a rule in active database is represented as an object de signed to appropriate to real -time active database.