The Qian'echong molybdenum deposit is a superlarge concealed porphyry deposit recently discovered on the northern slope of the Dabie Mountain. Based on a review of about thirty years' prospecting process from the discovery of the deposit to the prospecting breakthrough, the authors studied the ore-forming geological features and the characteristics of regional anomalies, local anomalies and primary anomalies. The geochemical ore-hunting indicators and patterns of the deposit were also summed up. The prospecting practice of the deposit demonstrates that geochemical exploration for porphyry molybdenum deposits is quite effective. The 1:200000 and 1:150000 stream sediment survey and the 1:10000 soil survey as well as the rock drilling survey all could uncover the indicating elements of porphyry molybdenum deposits, which serve as excellent ore-hunting indicators.