1. Introduction yilbas and Bin Mansoor (1) investigated the logistic character istics of the averaged heat flux across the thin film incorporating the s-curve. The researcher computed temporal behaviors of the heat flux vector using the Boltzmann transport equation to model transient phonon transport in a two-dimensional silicon thin The film surfaces were considered to be at a temperature differ of 1 K. They introduced the dispersion relations in order to account for the frequency dependent phonon transport across the film. they also introduced a generalized logistic curve (the s-curve ) to analyze the logistic characteristics of the tempural behavior of the averaged heat flux in the film. They then computed the averaged heat flux along the center line of the film that was parallel to the film thickness before examining the effect of film width on the characteristics of the averaged heat flux. They found that temporal behavior of the averaged heat flux followed the s-curve. the s-curve characteristics changed for various film widths The effect of the film width on the averaged heat flux characteristics was significant. In this case, increasing the film width increased the average heat flux value in the film. This behavior was related to the ballistic phonons contribution to the energy transport in the film. The ballistic phonons emitted and reflected from the film surfaces did not contribute considerably to the averaged heat flux As a result, the amount of the averaged heat flux corresponding to the small width films was less than that of the large width films.