Abstract: Based on the field investigation in Wudongde valley of the Jingshajiang River, and comparative analysis of available data from drills, silos and galleries in the different parts of the Jinpingzi debris deposits of the Wudongde valley, the basic features and original types of the debris deposits were investigated. Geomorphological, sedimentological and chronological analyses of debris deposits infilling the Jinpingzi reaches of Wudongde valley, are used to elucidate the geomorphologic evolution and stability of debris deposits. Thermoluminescence (TL) dating provides a temporal frame for the process of the river incision and fluvial sedimentation in the past. The samples in the bottom and in the top of the deposits give the TL ages of ca.1979.70 KaBP. and 86.617.36 KaBP., respectively, implying that the forming of the deposits took about 110 Ka. The Jinpingzi debris deposits were not due to landslides They were formed during three different phases of the geomorphic process of the river and formed thick layers of alluvia and collapsed cumuli. The Jinpingzi debris deposts are in a stable condition and would not affect the selection of the site for Wudongde hydropower station.