Shimiaozi Gold deposit in Xiuyuan county,Liaoning Province occurs in porphyric biotite monzonitic granite body and is controlled by a traceable "S"fracture.It is characteristic of magmatic hydrothermal gold deposit.The "S"fracture is in NE direction consisting of several fractures.Overprinting localities of the fractures are the conductive fracture of ore fluid and bends of the "S"fracture favorable for the ore fluid accumulation where higher grade ore generally occur.