Abstract: Based on former research findings, sedimentary system characteristics and potential uranium mineralization sections of the upper Sunjiawan formation of the late cretaceous located near Heishui were analyzed using principles of sedimentology, well logging geology, and stratigraphy. Results indicated that the Heishui area is in the formative stage of the upper Sunjiawan formation and is not located at the center of the Pingzhuang basin but lies on the edge of the basin. The sedimentary base level experienced a cycle in which elevation occurred during the early stage, a high point was reached in mid stage, and a drop off during the late stage. During this period, alluvial braided channel deposits were favorable to uranium mineralization.