Zhanjin Formation was named by Liang Dingyi at Zhanjin river, north of Jipu village, Duoma area, Ritu county. This paper showed Zhanjin Formation is located in the central uplift belt of Qiangtang, which was called “shallow metamorphic rocks”，whose age，forming environment and tectonic property have been considerable controversy. We measured profiles and dated the detrital zircon using U Pb method for Zhanjin Formation at Gangma Co area, Southern Qiangtang, Tibetean Plateau，where was the most typical exposed area for Zhanjin Formation. The results show Zhanjin Formation was the irregular Gondwana glaciation acting on the Paleo Tethys ocean basin in the north of Gandwana continent；At Gangma Co area，We identify three larger glaciers; the material source of Zhanjin Formation was the steady Gondwana continent after the Pan African movement and the Southern Qitang Baoshan Plate was a part of Gondwana continent. These studies afford evidences for the depositional environment in the northern margin of Gondwana continent.