Magnetic susceptibility data play an important role in the process of interpreting aeromagnetic anomaly. In order to better application of the high precision aeromagnetic data obtained in West Tianshan Mountains, the authors measured magnetic susceptibility at more than 500 points, and made a systematic arrangement and statistic analysis of these data. The magnetic susceptibility features of rock and ore were studied in the light of strata, lithology and ore. Based on the magnetic susceptibility data, the authors delineated hundreds of magnetic strata and identified 221 concealed or semi-concealed intrusive bodies. The authors inferred 109 magnetic anomalier of iron deposit and found more than ten iron bodies in West Tianshan Mountains.