Conceptual model is the modeling of real information world, which has little relation with DBMS. We usually abstract the concrete things in the real world and organize them into data models through some DBMS. People tend to abstract the real world into the information world first. In this step, we tend to abstract the objective objects in the real world into an information structure, which is a concept level model and does not depend on the specific computer system and DBMS. Then we transform the model into a data model supported by a DBMS on the computer, and then we transform the information world Boundary simulation is transformed into machine world. In fact, conceptual model is an intermediate level from the real world to the machine world.