The rapid simulation of wake flow has important scientific significance and engineering application. In this paper, a fast calculation method is constructed based on the equation of vortex, and a plane wake is simulated and investigated based on this method. The reliability of this method is validated through comparison with results from previous studies. It is found that this fast calculation method can accurately simulate the formation and evolution of Karman vortex street in the wake region. Analysis of the wake profiles reveals that the positions at which different turbulence statistics reach a selfsimilar state vary, and a nonequilibrium selfsimilar region is observed upstream of the wake. The results of the present study not only enhance our understanding of turbulent wake characteristics, but also be of significance for engineering applications, such as predicting and controlling wind turbine wakes in wind farms.