The southwestern Fujian is located in southwestern Wuyishan mineralization zone, where nappe（slippage）structures extensively developed after a multi-stage tectonic evolution since the Proterozoic, with control over “Ma Keng”-small, medium and large iron polymetallic deposits in the region. A ore-controlling geological-geophysical model of the nappe structure in southwestern Fujian is established by surface geological analysis of distribution and tectonic framework of the deep ore-bearing rock and nappe interface combining the interpretation of deep controlled source audio magnetotelluric method（CSAMT）, which will certainly facilitate deep prospecting.