This article describes the use of a distance model, which is based on the 3S model theories of global positioning systems(GPS), geographical information systems (GIS) and remote sensing (RS). The distance model is used to analyse the amount of water consumed in real and simulated water conservation forestry. The quantitative analysis of water conservation forestry is useful to macro-decision making in relation to water consumption. Calculation of the amount of water consumed accounts for forestry plot conditions, forest type, slope direction, solar radiation incidence and temperature. The 3S based model utilises spatial information and a resulting digital elevation model to generate vector graphs for land use, water conservation, forest type and soil type. These are used with Penman-Monteith to calculate the water consumption of the research forest area.