In this paper, an agent model for the integration of multimedia object presentation is established by using events-conditions-actions mechanism and considering object-oriented characteristics of multimedia objects. This model is a dynamic model, which integrates contents, temporal relations and spatial relations of multimedia objects and supports user interactions. Because it controls objects by message passing, the encapsulations of objects can be maintained. Events-conditions-actions mechanism is employed in active database intensively and has mature technologies. The expressive ability of this model is described by using it to the temporal relations defined by Allen, and it is also verified with an example. Its contributions to multimedia database systems are also analyzed.