Abstract: Based on field geological investigation, petrography and chemistry, this paper calculates the whole rock Zr saturation temperature, two-feldspar equilibrium temperature and the alteration temperature of chlorite for Xinxian granitic batholith, Bao’anzhai granitic stock and Dayinjian granitic stock. With reference to previous research, we elaborate the rock forming temperature, pressure, depth and the relationship with mineralization of early Cretaceous granites in Xinxian region. The study shows that the whole rock Zr saturation temperatures of Xinxian granitic batholith, Bao’anzhai and Dayinjian granitic stocks are 759℃, 773℃ and 748℃ respectively, representing the maximum temperature of the rock formation, while two-feldspar equilibrium temperatures are about 358℃, 454℃ and 467℃ respectively, representing the minimum temperature of the rock formation. Biotite whole aluminum barometer shows that the rock forming depths are 4.3 km-7.6 km, 3.3 km-8.7 km and 5.5 km-9.6 km respectively, corresponding to the pressures as 1.15 kbar-2.01 kbar, 0.86 kbar-2.31 kbar and 1.46 kbar-2.54 kbar respectively, indicating these plutons emplacing in the upper crust. Chlorite mainly belongs to clinochlore forming in the reducing environment with the formation temperatures as 285℃, 290℃ and 309℃ respectively, which are roughly similar with the ore-forming fluid boiling temperature.