Chou's theory of turbulence is applied successfully to the wakes behind a system of equal distant parallel rods and a square grid. It is found that both the velocity and temperature distributions in the first kind of wake are the same cosino functions of the coordinates across the weke and those for the second kind of wake are just the superpositions of the wakes beind two perpendicular systems of parallol rods. In both cases Taylor's law of linear decay of turbulent fluctuation and quadratic increase of scale of micro-turbulenco are obtained.