The invention provides a fuzzy evidence weight analytical method and technology for mineral forecasting, mineral resource assessment as well as environmental assessment. The forecasting for the minerals resource is completed by constructing multivariate space multivariate spatial information database, forming the spatial information evidence picture layer of minerals forecasting through data processing and information extraction, obtaining the forecasting weight of evidence picture layer through calculation, drawing the probability picture of minerals resource prediction through comprehensive multilayer evidence picture layer. The invention has the advantages of broad practicality and less information loss, high forecasting precision, and is suitable for multisource geological data, for example geological data, mineral data, geochemistry data, geophysics data and remote sensing data or the like, to carry out the precasting process such as information extracting, data integration, mineral resource assessment, mineral detection, environmental contamination assessment, natural calamity, risk assessment, ect.