The problem caused by highspeed trains passing in a long channel tunnel has become a key problem which must be considered before constructing a tunnel. Therefore it is very important to calculate the airflow in the tunnel. The importance, research methods and results in the domain of aerodynamics in the channel tunnel are introduced. Especially, based on the special structure and physical model of English Channel tunnel, how to establish numerical models, control equations and their boundary conditions etc are presented in this paper. Moreover, the traditional methods which can only simulate the change of pressure and flow velocity in a tunnel are improved. Based on the special structure of channel tunnels, the onedimensional compressible flow nonisentropic model with boundary conditions is proposed in this paper.