By the research of geological conditions of geotherm in Lanzhou-Minhe basin, it is considered that the basin lies east section of Middle Qilian Upfold Belt and on the deep-stope belt of crustal thickness, where the deep and great faults with NWW and NNW direction become ascending channels for deep thermal source, and control the distribution of geotemperature.Combination of heat conducting faults and low conductive stratas easily form geothermal anomaly region. There are layered and banded thermal reservoirs in the basin. The conceptual model of geothermal reservoir in the basin is proposed in the paper, that is deep crust provides thermal resource; deep and great faults conduct geotherm;low heat conductive stratas accumulate geotherm and ground water runoff supply water.