Abstract: The magma source，diagenetic environment and diagenetic mechanism of Qinggangping Granite were analyzed from aspects of the geological features，the petrography，the geochemistry characteristics of major elements，trace elements and rare earth elements.The results indicated that w(Na₂O)+w(K₂O)，AR，σ and average value of A/CNK varies from 6.51% to 8.67%，1.99 to 3.57，1.94 to 2.60 and 0.97，respectively，which means the granite belongs to calc-alkaline and metaluminous rocks.The magma experienced greater crystallization differentiation during the evolution period and the ratio of LREE and HREE is between 5.74 and 11.75.δEu and δCe values from 0.63 to 1.05，and 0.79 to 0.85，respectively，which means that the granite has weak negative anomalies of Eu and Ce.Th，U and high field intensity of Hf in the granite show relative enrichment，while Ba，Ni and Ti are at relative loss.The magma source of Qinggangping Granite is un-weathered igneous' remelting in the crust，and is formed in the post collisional orogenic environment as granites of type I. Qinggangping Granite|The ore-forming environment|Diagenetic mechanisms