Numerical investigation is made on the effect of streaky structures in transition by inviscid linear disturbance equation with temporal mode. Several disturbances with different streamwise wave numbers were induced, and the evolutions with time step were received. It suggests that the exponential growth and periodic variation of the waves are in existence. As the streamwise wave number increases, the disturbance growth rate begins by increasing, reaches a maximum at around α =0.4 with a disturbance frequency of 0.2186+0.001457i, and then decreases. Furthermore, the eigenfunctions of pressure disturbance are plotted.