The study area is located in the south of late Paleozoic to early Mesozoic rift zone in Zongwulong Mountain—Qinghai Nanshan Mountain(southern Qinghai Mountain), and its tectonic position lies in the third grade tectonic unit of Oulongbuluke Block in Qinling—Qilian—Kunlun orogenic belts. Due to the influence of multiperiod tectonic movement and magmatic activity, various type of intrusive rocks and volcanic rocks were formed. The molasses of the MaoniushanFormation is considered as a sign of the end of the early Paleozoic orogeny. Up to now, alittle study on petrology and geochemistry of volcanic rocks in Shidiquanarea in Delingha city has been reported, and the formation age of mafic rocks is still unknown as well. Therefore, the authors of this paper intends to take volcanic rocks that crop out in Shidiquanarea as research objects. Through detailed field observation as well as petrological analysis, geochemical analysis and UPb isotopic dating method, we will discuss the problems of petrological and geochemical characteristics, formation time and magma origin in the study area in depth.