One of the acoustic parameters that are directly affected by the spatial distribution is the mean free path parameter. The acoustic response of closed space depends on the two components of the form and the absorption or reflection characteristics of the internal surfaces. The geometric form of space determines the distribution of the mean free path of the space, and the general mode of distribution in the space can express the acoustic response of that space. In order to check the effect of the mean free path distribution parameter on other parameters of the space, it is necessary to simulate the conditions in which it can be said that the changes made in the characteristics of other parameters are caused by the change of the mean free path distribution. The most important factor that affects the parameter of the mean free path is the geometry of the space, but since the volume and total area of the surfaces have an effect on other parameters, the two spaces should be designed in such a way that it can be said that the changes in the two parameters of reverberation time and speech transmission index are derived from the difference in the distribution of the mean free path distribution. In this research, two spaces with relatively equal volumes but with different geometries have been used to investigate the effect of mean free path distribution. In the obtained results, we will see that when the distribution of the free path of space has a higher uniformity, the values of reverberation time and speech transmission index are closer to the standard conditions.