The Jinping block is located on the western margin of Yangtze craton. In this area, the magmatic liquation and pulsatory injection type copper and nickel ore deposits lie in ultramafic and mafic intrusions, which are genetically related to the Permian basalts of southwest China. These deposits share good geophysical features suitable for EM survey. The Helicopter-towed Electromagnetic Survey, as a very useful advanced exploration method for targeting mineralization, is employed in the prospecting for copper and nickel sulfide deposits and, combined with ground geological, geochemical and geophysical survey, can be expected to locate the target area quickly and accurately for follow-up work.