The Shandong Peninsula is one of the most important bases of gold resources in China. In recent years, a great breakthrough has been made for prospecting concealed gold deposits in deep and offshore areas. Especially,a superlarge gold deposit has been found in the offshore of northern Sanshandao. The main ore body in the offshore of northern Sanshanddao connect to the main ore body in the Sanshandao deep district,both of them is a unified ore body. It is the largest single gold ore body in China, with more than 500t gold, 3000m length along its strike and 1700m length along its tilt direction. The gold deposit in the off shore of northern Sanshandao occurs in the footwall of the Sanshandao fault, and is a typical gold deposit of fracture zone altered rock type. The largest No.4 orebody is located at the level of -796~-1736m, with a 1446m length along its strike, and 1072m along its tilt direction. Its average thickness is 30.91m, and average grade is 5.23g/t. This gold deposit consists of shallow and deep ore body groups, both of them are enriched at the gentle segments and the transitions from the steep to gentle along the deposit-controlled fault, forming a ladder-like or staircase distribution pattern, which termed as step metallogenetic model. The shallow ore bodies in the first step are above -600m, with dip angle of 25°~50°. While the deep ore bodies in the second step are below -1000m, with dip angle of 35°~40°, and have more gold resources, larger ore body scale, bigger thickness and higher grade than the shallow ones. The ore controlled fault, the Sanshandao Fault is a volatile S-shaped along its strike and a shovel-type along its inclined direction, coupled with an alternate variation dip angle between steepand slow, forming a ladder-type fault. Its footwall is deformed strongly and is of large thickness. From the shallow to the deep along inclination, the fault becomes larger in thickness, greater in ductile deformation, and increasing in the ore metallogenic space and ore body. All these characteristics suggest that the Sanshandao Fault is a listric normal fault, and its formation may have close affinity with the Tanlu Fault activity that took place in the Early Cretaceous. Besides the Sanshandao Fault, other extensional structures in Shandong Peninsula are controlled by the SEE extension stress. The isotopic dating of metallogenic coincides with the diagenetic epoch of Weideshan granite and intermediate-mafic dykes in gold deposits, which infers that they are the products of magmatic activities in the early Cretaceous. These magmatic activities may play an “engine” role in the gold mineralization, causing the reactivation of gold in surrounding rocks and raise part of the gold from the Mantle, which supply part of the ore-forming materials sources. In Cretaceous, lithosphere upwelling eastern China, and tectonic-magmatic activities are intense. In Shandong Peninsula, influenced by the large scale intensive magmatic activities in the early Cretaceous, the Linglong granitic batholith formed in the Jurassic had undergone strongly uplifting.Meanwhile，the metamorphic rocks above the batholith were greatly detached, and the detachment structures were formed, including the Sanshandao Fault, the Jiaojia Fault and the Zhaoping Fault.These kinds of upwelling-extensional structures could provide favorable conditions for gold mineralization. In summary, these magmatic activities provide appropriate materials and heat sources, as well as fluid for gold forming, and the upwelling-extensional structures provide space for the gold mineralization.The coupled system of structures, magma and fluid resulted in large scalemineralization of the Jiaodong-type gold deposits.