The invention puts forward a simulation method for an actual/ virtual /constructive-oriented hybrid system, and belongs to the technical field of distributed parallel collaborative simulation. The simulation method comprises a network communicator, an event manager, a time manager, an entity class manager, an entity class interface definer and an entity class logic definer, wherein the network communicator generates entity class agents and provides network communication service; the event manager realizes subscribing and publishing management based on a discrete event; the time manager provides two methods including conservative time advancing and tolerance time advancing; the entity class manager is used for managing an entity class; the entity class interface definer receives the interface description file of a user for each entity class, analyzes the file, generates each entity class, and adds a network agent module, an event management module, a time management module and an entity management module into each entity class to form a simulation prototype system; and the entity class logic definer realizes business logic for the user in the entity class. The method supports the generation of a fine granularity entity class in the actual/ virtual/ constructive-oriented hybrid system, and each entity class has the characteristics of being high in interoperability, composability and reusability.