Peru is rich in iron ore resources. Aeromagnetic is an important approach for iron deposit prospecting directly or indirectly. In order to understand distribution of iron bodies by using aeromagnetic information, various data process approaches such as reduction to the pole, continuation and derivative have been carried out for the 2 250 000 km² aeromagnetic raw data. Combined with regional geological structure and geological strata and lithology of Peru, various magnetic anomalies concerned with iron ore types are selected. The anomalies include: anomalies induced by continental facies eruption;the magnetic anomalies which are controlled by faults and concerned with the volcanic eruptions in early and middle Tertiary;the anomalies induced by the early and middle Tertiary volcanic eruptions covered areas;the positive magnetic anomalies belt induced by the coast rock band;anomalies induced by post-magmatic hydrothermal iron ore vein located in diorite rock;skarn iron ore anomalies.