The western China to Qinghai-Tibet area covers Gansu, Qinghai, Xinjiang, Tibet and western Sichuan, where distributes lots of sedimentary basins hosting abundant oilshale resources. The oilshale resources reach to 195.263 billion tons in these areas, about 4.44% of the total in China, the oilshale potential is 193.039 billion tons, 28.82 of the total in China, indicating a big potential in these areas. The genesis of oilshale can be classified as sapropel , humosapropelic and humic, formed in lakes, marshes and lagoons, where the oilshale is quality, most more than 10% in oil-bearing rate. The oilshales are distributed in the upper Paleozoic, Mesozoic and Cenozoic, becoming younger southwards in oilshale formation ages. This paper, based on a prioritization of exploration targets, selects 9 target areas as most favorable areas, 7 as favorable areas, and 4 as sub-favorable areas.