The Stype and the Itype granite are distributed widely in Hebei province,which the first  type hasn't

ore potentiality ,but the second type has better ore potentiality and widespread mineralization. The Hebei province

high precision aieromagnetic data have been analyzed in this paper, We sums up and compares the anomaly character

between the S-type and the I-type granite, and distinguish the anomaly between ores and barren rocks, aieromagnetic

anomaly of the two types of granites are illustrated respectively and the causes of magnetic anomaly are also

analysed.and last the targets are been indirectly delineated.