Abstract: The Volcanic rocks and granite porphyry are widely distributed in Laochang mining area，Lancang county，which are regarded as the main metallogenic geological body of volcanic gush flow depositing metallogenic system and deep porphyry hydrothermal metallogenic system.The titanium magnetite in the olivine basalt of the volcanic rocks is conducted on spectrum analysis，the different minerals of amygdaloidal sodium trachyte lava and the microcrystaline potassium feldspar of almond-shaped potasium trachyte lava are analyzed by electron microprobe respectively.Besides that，the times and petrological characteristics of volcanic rock，the times，cause，source area and wall rock alteration characteristics of granite porphyry in mining area are summarized comprehensively.The analysis results show that:①the volcanic diagenetic age is the early carboniferous epoch，and it owns the important ore-bearing lithology of the Ag-Pb-Zn mine in mining area,the space-time distribution of the ore deposit is controlled by the mining volcanism，which provides materials basis and important driving force of heat source for metallogenic activity；②concealed granite porphyry is the porphyry molybdenum ore-forming parent rock in mining area，and the granite porphyry intrusion period belongs to the early himalayan magmatic activity；③the early carboniferous volcanism and magmatism in himalayan period provide favorable conditions for the formation of metallogenic system.The above research results have some certain reference value for analyzing the metallogenic system.

Key words: Volcanic rock, Concealed granite porphyry, Ore-bearing rocks, Superimposed metallogenic system