The Hongge layered intrusion hosting the largest V-Ti-magnetite deposit in the central part of the Emeishan Large Igneous Province (ELIP) can be divided into the Lower Zone, Middle Zone and Upper Zone from the bottom to the top. The contents of hornblende in the hornblende (magnetite) clinopyroxenite and hornblende (magnetite) olivine clinopyroxenite of the Lower Zone reach up to 5% 15%, which are much higher than those of other layered intrusions hosting giant Fe-Ti oxide deposits in the Central ELTP. Poikilitic texture and homogeneous interference color of the hornblende indicate that it is primary magmatic origin, rather than the product of hydrothermal alteration. Moreover, the hornblende is high in Al20, contents (10. 5% - 12. 0%), Al/Si (0. 30 - 0. 37) and Mg/ (Fe3+ Fe2+ + VI Al) (1. 69 - 2. 63) ratios, and low in Sil(Si + Ti + Al) ratios (0. 69 - 0. 74), suggesting that it crystallized from a mantle-derived mafic magma. The phlogopite is high in MgO contents (18. 7% - 22. 9%), demonstrating that it is also associated with mantle-derived magma. The genesis of the hornblende and phlogopite is consistent with the geological background of the Hongge layered intrusion, and it is thus possible to be used to estimate the thermodynamic conditions of solidification of the Hongge intrusion. The calculations using electron microprobe data indicate that the hornblende crystallized at the temperature of 1000 - 1100 C, the pressure of lower than 2. 2kbar and the oxygen fugacity of NNO 0. 55 to NNO + 0. 73. Magnetite crystallized earlier than hornblende in the Hongge intrusion according to lithologic textures, thus, combined with the MELTs calculation, we estimated that the Fe-Ti oxide ore layers of the Hongge intrusion crystallized at the temperature of 1100 1165 C and the oxygen fugacity of higher than NNO + 0. 73. The ratios of Fe3-7(Fe3+ /Fe2+) of the hornblende as well as Fe3+ /Fe2+ and Mt/ (Mt + Ilm) of the whole rock decrease upwards in each cycle unit of the Lower and Middle zones of the Hongge intrusion, whereas, V2O3 contents in the magnetite increase upwards, indicating that oxygen fugacity decreases upwards during fractional crystallization of magnetite. However, the whole-rock Fe3+/Fe2+ and Mt/(Mt + Jim) ratios increase as the magnetite V2O3 contents decrease upwards in the cycle unit IX of the Upper Zone, which are opposite to those in the Lower and Middle zones, indicating that oxygen fugacity increased upwards in the cycle unit IX of the Upper Zone which is probably due to the P2O5 enriched parental magma of the Upper Zone.