Abstract: The Process simulation software based on equation-oriented technique can only be used by experts but not by most engineers.The object-oriented modeling (OOM) method is the most effective means to tackle this problem. The current OOM technique has great limitations in the reuse and inheritance of built-in classes. One of the most essential reasons is that the process characteristics lacks general description of the process, which must be provided by a theory that gives chemical processes an overall knowledge. It was found that the theory of Field and Flow put forward by Chinese scholars gives chemical processes a systematic knowledge. Based on this theory, a new object-oriented modeling method was proposed. The foundation class library of chemical engineering process was built up with the abstraction of hierarchy of chemical processes, which includes the setups of Flow class, Field class, Space concept and supporting classes. This new modeling method was used in isothermal flash and non-equilibrium reactive distillation stage to test the validity and adaptability, and was proved effective. This method is rigorous in encapsulation of chemical objects and can be inherited to build new objects from foundation class conveniently. Also, this method can process easily the transition between macro and micro world for which other modeling methods cannot process. The field and flow based object-oriented modeling method paves the way for popular use of the equation-oriented method.