Using average annual precipitations data for period 1961-90. from all rain gauges in Serbia, southern of Sava and Danube rivers, the map of altitude precipitations gradient is constructed. 59 regions homogeneous for relation X=f(H) are obtained by regression analysis method (two-dimensional type, X precipitation height and H - altitude). Some new method are applied, some limitations are shown, some regularities are found in disposition of precipitation growth and it is indicated on practical application of this method in physico-geographical research.