libri>Based on geological and geochemical study, it can be concluded that the Huashan and Guposhan granite batholiths have an emplacement depth of 5. 5 km, the country rocks temperature of 196℃libri; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-size: 10.5pt" lang=EN-US>libri>, and initial granite melt temperature of 950℃libri; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-size: 10.5pt" lang=EN-US>libri>during process of emplacement. Mathematic model established in this study yields that, after emplacement of the granites, cooling timelibri; mso-hansi-font-family: Calibri; mso-bidi-font-size: 10.5pt">(libri>Δtcollibri; mso-hansi-font-family: Calibri; mso-bidi-font-size: 10.5pt">)libri>from its initial temperature to crystallization temperature of granite melt is 4.14 Ma for Huashan and 4.36 Ma for Guposhan. Because latent heat released from crystallization prolonged cooling time by 2.67 Ma and 2.81 Ma, and granite batholiths in these two areas contain more radioactive elementslibri; mso-hansi-font-family: Calibri; mso-bidi-font-size: 10.5pt">(libri>Ulibri; mso-hansi-font-family: Calibri; mso-bidi-font-size: 10.5pt">:libri>13.5×10-6, Thlibri; mso-hansi-font-family: Calibri; mso-bidi-font-size: 10.5pt">:libri>56.1×10-6, K2Olibri; mso-hansi-font-family: Calibri; mso-bidi-font-size: 10.5pt">:libri> 5.79%for Huashan;Ulibri; mso-hansi-font-family: Calibri; mso-bidi-font-size: 10.5pt">:libri>13.7×10-6, Thlibri; mso-hansi-font-family: Calibri; mso-bidi-font-size: 10.5pt">:libri>52.4×10-6 and K2Olibri; mso-hansi-font-family: Calibri; mso-bidi-font-size: 10.5pt">:libri>5.28%for Guposhanlibri; mso-hansi-font-family: Calibri; mso-bidi-font-size: 10.5pt">)libri>, higher than the average content of radioactive elements in granitelibri; mso-hansi-font-family: Calibri; mso-bidi-font-size: 10.5pt">(libri>Ulibri; mso-hansi-font-family: Calibri; mso-bidi-font-size: 10.5pt">:libri>5×10-6, Thlibri; mso-hansi-font-family: Calibri; mso-bidi-font-size: 10.5pt">:libri>20×10-6 and K2Olibri; mso-hansi-font-family: Calibri; mso-bidi-font-size: 10.5pt">:libri>2.66%libri; mso-hansi-font-family: Calibri; mso-bidi-font-size: 10.5pt">)libri>, radioactivity resulting from Huashan and Guposhan granites prolonged crystallization time to 37.6 Ma and 45. 1 Ma, much longer thanΔtAvalue calculated for world average graniteslibri; mso-hansi-font-family: Calibri; mso-bidi-font-size: 10.5pt">(libri>3.17Ma, Huashanlibri; mso-hansi-font-family: Calibri; mso-bidi-font-size: 10.5pt">)libri>. Time differenceslibri; mso-hansi-font-family: Calibri; mso-bidi-font-size: 10.5pt">(△libri; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-size: 10.5pt" lang=EN-US>libri>tECTDlibri; mso-hansi-font-family: Calibri; mso-bidi-font-size: 10.5pt">)libri>of emplacement and crystallization of two granite batholiths are 44.41 Ma and 52.27 Ma. In combination with zircon U-Pb ages of 162 Ma for Huashan and 163 Ma for Guposhan, inversion calculation yields emplacement ages of 206 Ma and 215 Ma for Huashan and Guposhan granite batholiths, and this provides important magmatic and dynamic evidence for emplacement of Huashan and Guposhan granite batholiths at the Indosinian period.