In order to solve the under generalization to object dynamic behaviors in passive objects models，this paper presents an active objects model which abstracts active behaviors of objects．In this active objects model with events，an active object could probe whether an event happens outside，and then automatic determines its own action．Active objects class is discussed，which could give abstract description of those active objects having the same properties．Computing objects are introduced to coordinate other objects．A computing object might be an agent of a running system．