Abstract: In the design of simulation model for communication system,the empirical formulation is usually introduced to build up the physical layer model.However,generally such empirical formulation method suffers from two drawbacks: it fails to represent the practical scene configuration,and it cannot guarantee the modeling accuracy.In the aim of improving the effectiveness of the simulation model,the modeling accuracy of the physical layer should be further enhanced.In this paper,we build a new simulation model for the ultra-short communication system and implement a simulation system by using OMNET++ based on its Simulink channel model and WI model.Experimental results confirm the accuracy of the built model compared with the empirical formulation modeling method for the physical layer.Finally,we analyze the factors affecting the performance result.