Abstract: The EW-trending Sanshandao, Jiaojia and Zhaoping fault zones are three world-famous gold metallogenic belts in Northwest Jiaodong High Gold Ore Concentration Area. The hanging walls of these faults are all composed of Early Precambrian metamorphic rocks. Based on them, these fault zones constitute a large "S"-type extensional structure in the section perpendicular to the strike of these three faults. Moreover, each of these three fault zones extends and is distributed in "S"-type ones both along the strike and in inclination, and gold ore bodies occur in the structural alteration zones controlled by these three "S"-type structures. It is called the unique "tri-S-type" ore-controlling mechanism of Northwest Jiaodong High Gold Ore Concentration Area. It is believed that this new idea is helpful in discovering deep and blind ore bodies.