Forest stand which has a complex ecological process has been subjected to various studies in a number of forestry disciplines with its properties such as height, diameter, trees per ha, density, basal area, species mixture and composition etc. Even though these properties offer valuable information about stand description, they are still insufficient in the aspect of stand spatial structure and composition. However, there has been increasing demand of new approaches in implementing forest sustainability. As a proper example of such demand, a 60x70 m sample araea was taken in Belgrad Forest, Istanbul and locations and diameters of the tress in the area were measured in this area. Mixture of this sample area along with four different scenarized sample areas created from the original sample area were determined by non-spatial methods. Then determinig mixture of these 5 areas with spatal analysis (mingling index) and compare to the non-spatial methods: In non-spatial methods, analysis results show that all five sample areas mixture and species ratio have given the same value. On the other hand, using spatial analysis for these five sample areas has been resulted in different mingling graph results and stand spatial structure differencies have been well determined. As a result, using spatial mixture analysis like mingling index forest ecological process will be determined reliably and thus will make valuable contribution to technical forestry practices.