According to an analysis and sumarization of the geological, mineral resources and geochemical characteristics of the Xiaojiayingzi molybdenum ore district, the authors tentatively established a geological-geochemical prospecting model for porphyry-skarn type molybdenum ore deposits:the geological conditions are characterized by exposed strata of Wumishan chert bands-bearing dolomite and chert nodule-bearing dolomite, strong magmatic activity, and development of fractures before mineralization;the regional geochemical anomaly finds expression in the anomalies of Mo, W, Au, Cu, Pb and other elements, and each single element has its significant concentration center in the high value region; mineralization is partly expressed as significant zonation of elemental composition among ore body, contact zone and stratigraphic distribution, with Mo, W, Cu, Au serving as near-ore indicator elements combination. The establishment of the geological-geochemical prospecting model provides an important basis for the prospecting for the same type of deposits, the delineation of prospective areas, the selection of prospecting targets and the estimation of resources.