Abstract: The measure of adjacent space's distribution researches into objects' distribution in adjacent space.It is the important basis of geographic analysis,environmental assessment,also location optimization.A Voronoi-diagram based method to measure adjacent spatial distribution is proposed,which dynamically determines the related extent according to measure point's Voronoi adjacent relation,and assesses the adjacent space's distribution based on the index of adjacent distribution.The method can measure any point's adjacent distribution.Furthermore,it can be used to evaluate the dispersion degree at overall level.Finally,an applied example evaluating the development of building lots and landscape protection is given to illustrate the application prospects.