The early Paleozoic paleogeographic position and tectonic affiliation of the Qaidam block remain contentious. The Qaidam block may be located in a low latitude area according to sedimentological and paleontological evidences, but this view lacks paleomagnetic quantitative constraints. This study performed a paleomagnetic investigation of the Lower Ordovician Duoquanshan Formation limestone from the Oulongbuluke area in the Qaidam block. The site- mean direction of the 8 sampling sites was Ds=345. 3°, Is=-14. 5°, κs=54. 8, α95=7. 5° (tilt- corrected). The characteristic remanent magnetizations are away from the present geomagnetic field direction, and all reversed polarities in all samples are consistent with the Moyero Reversed Polarity Superchron. These findings indicate the primary origin of the characteristic remanence in the studied section. The Early Ordovician paleomagnetic pole of the Qaidam block lies at -43. 4°N/116. 9°E (dp/dm=3. 9°/7. 7°), and the corresponding paleolatitude is 7. 4°N±5. 5° (reference point: 37. 2°N/96. 6°E). This result indicates that the Qaidam block was located near the equator during the Early Ordovician. Based on paleontological information, the Qaidam block may be located north of the South China block and northwest of the Australian during the Early Ordovician.