This article through to the southwest of aeromagnetic data, vertical guide and continuation of treatment, Southwest research aeromagnetic regional characteristics, determine the aerial magnetization in delay 20 km contour map as aeromagnetic regional anomaly in southwest China, the regional aeromagnetic anomalies in southwest divides the 13 partitions. Combined with geological, gravity, natural comprehensive inference and interpretation, seismic and remote sensing data could be divided into three first-order tectonic units in the southwest, 9 second-order tectonic units, 22 level 3 tectonic units; And focusing on six secondary tectonic units of geological and mineral and aeromagnetic anomaly characteristics, etc. Carried on the thorough analysis and research. Think high class-nujiang anomaly zone, the yarlung zangbo river and lake zones, sanjiang anomaly zone beaded magnetic anomaly are in good agreement with the properties of the metallogenic belt, prove that aeromagnetic anomalies is looking for a magnetic mineral effect is remarkable. Delay 10 km on the aeromagnetic anomalies and the quake's epicentre point comparison analysis research, proves the obvious, aeromagnetic reflect the characteristics of the deep fracture structure can obviously reflect the regional geological tectonic characteristics in southwest China.