Located in southeastern part of Yangtze Block, Mufushan complex batholith has an emplacement age of 145 Ma（Zircon U-Pb）. Granodiorite and its mafic microgranular enclaves from the batholith contain characteristic monocrystalline epidotes. Most of these epidotes are idiomorphic, and they are featured frequently with melting corrosion structure and occasionally with allanite-rich cores. The Ps values ((100Fe3+/（Fe3++Al）)of both kinds of epidotes mainly fall between 26 and 28, while TiO2 contents of these epidotes are less than 0.2wt%. It is suggested that these epidotes are magmatic genesis. Results from petrographic study suggest that the crystallization order in both granodiorite and mafic microgranular enclaves begins with amphibole and epidote, and then comes biotite, plagioclase and other minerals. Mineral assemblage and the compositional analysis of calcic amphibolites from granodiorite and mafic microgranular enclaves show that these calcic amphiboles are suitable for the Anderson and Smith’s Al-in-hornblende barometer, and the barometer gives a crystallization pressure of about 4.05 kbar for the host granodiorite. Mineral Chemistry shows that biotites in the host granodiorite and mafic microgranular enclaves are formed around the NNO buffer, meaning the coexisting pressure of epidote and plagioclase is higher than 8.5 kbar. Since the melting time of magmatic epidote is related to its dissolution width, we calculated the dissolution width of these epidotes, and based on maximum dissolution width, the minimum ascent rate of the Mufushan granodiorite is 170m/year, implying a quick ascent along fissures. Taking the stripped distribution of the granodiorite into consideration, a northeast tensional tectonic environment is suggested during the emplacement of the magma.