Abstract: The Jiudingshan copper-molybdenum polymetallic deposit is located in the holding area of Jinshajiang-Honghe fault and Chenghai-Binchuan fault. The geological tectonic unit has undergone a long-term evolution process，and the tectonic-magma activity is strong，which provides a favorable metal‐ logenic geological background for the formation of the deposit. Based on the results of geological work in the mining area，the regional metallogenic background，geological characteristics and metallogenic mecha‐ nism of the deposit are analyzed，and the metallogenic model and prospecting criteria of the Jiudingshan Cu-Mo polymetallic deposit are discussed. The results show that there are multi-stage magmatic activities in the region，which are strictly controlled by the structure. The Himalayan magmatic rocks are directly re‐ lated to the mineralization of the Jiudingshan deposit and are the main ore-controlling rock masses in the mining area. The third member of the Yingfengcun Formation of the Middle Ordovician is the main ore�bearing horizon and direct surrounding rock of the deposit. The mineralization (body) is irregularly distribut‐ ed in the direct contact part of the Machangqing rock mass and the monoclinic structure of the mining area. The ore mineralized（body）in the mining area is closely related to the alkali-rich porphyry in the Himala‐ yan period. The rock provides the mineral source for mineralization，and also provides the metallogenic power for the enrichment of the ore body. The mining area has formed a multi-stage，multi-stage and multi-type deposit combination type，and formed different mineralization types with the evolution of mag‐ matic hydrothermal fluid. Each stage of metallogenic evolution and regional porphyry magma belong to the product of a tectonic-magma-metallogenic system.

Key words: copper-molybdenum ore, geological characteristics, metallogenic mechanism, prospect‐ ing criteria