A method of constructing an optimized network simulation environment according to the present invention includes the steps of identifying communication equipment models for relaying a message to/from real equipments out of communication equipment models within a network model, as major models, calculating the order of abstraction priority for major models, performing batch-mode abstraction for non-major models, driving a simulation, determining whether a difference between a simulation execution time and an actual time spent is within an allowable delay value, performing adaptive abstraction for the major models, and evaluating a result of the simulation. If the method according to the present invention is used, a real-time simulation having fidelity and reliability for the function and operation of real equipments can be guaranteed.