This paper describes the effects of applying high-precision aeromagnetic survey in West Tianshan area. The high-precision aeromagnetic map contains very abundant magnetic anomaly information. The known iron deposits are clearly demonstrated in the map and, in addition, more than 50 iron anomalies are reflected in the map. The inspection of five anomalies led to the discovery of four ore-related anomalies, which are No.14,No.20,No.169 and No.374 anomalies. The discovery of these four ore-related anomalies has not only brought remarkable economic benefit but also provided typical examples for further application of high-precision aeromagnetic survey to the ore-prospecting work. Based on the results obtained, the authors hold that the high-precision aeromagnetic survey can be effectively used in the West Tianshan area and even in the whole low-exploration areas of western China for the purpose of prospecting for ferromagnetic ore resources.