Zhunuo porphyry deposit, newly discovered in the west of southern Gangdase metallgoenic belt, Tibet, is a typical porphyrytype CuMo deposit with a very large Cu reserves. Rutile is one of the typical accessory minerals for porphyry copper deposits. Therefore, its composition and texture can deduce the evolution process of oreforming fluids and determine the main orebodies. Based on detailed field geological work, metallogenic porphyry (biotite granodiorite) samples from the potassic alteration zone were studied. The results indicate that the rutiles usually coexist with magnetite (Ⅰ kind) and hematite (Ⅲ kind), both of which occur in and around biotites. Striped (long10~0 μm, with 3~10 μm), granular (diameter 10~40 μm), or irregular rutiles occur within quartzpyrite veins (Ⅱ kind). The three occurrences of rutiles formed in three conditions: the I kind of rutiles was formed by the reaction of titanic magnetite under the condition of Srich environment during or after the alteration of biotite or titanite; the Ⅱ kind of rutiles was formed by reaction of ilmenite in the Orich environment during or after the alteration of biotite or titanite; and the Ⅲ kind of rutiles directly precipitated from the Tibearing fluid. The metallogenic porphyry has the high concentration (066 wt.%) of TiO2, which provided abundant oreforming material source. Electron microscope analyses show that rutiles are dominantly TiO2 of 94%, but relatively enriched in V2O3，Nb2O5，FeO，WO3，CaO，SiO2，Al2O3 and ZrO2, with few or without MgO and MgO The compositions of V2O3 and Nb2O.5 range from 020 ot 2.39 wt % (with an average of 0.49 wt%) and from 0.20 to 4.63 wt%( with an average of 1.25 wt%) respectively. And average compositions of WO3 and FeO are 192 wt% and 181 wt % respectively, with about 005wt.% of ZrO2 in rutiles. When carrying out exploration outside the Zhunou deposit using rutiles, the first consideration should be the composition of V2O3 in retiles above 02wt.% （Ⅱ kind should be above 05 wt.%), and then the composition of Nb2O5 should be considered above 02 wt.% (Ⅲ kind of retiles should above 26 wt.%) . And the high concentration of W，Fe , the anomaly of Zr should also be considered. Furthermore, the grain size of the Ⅱ kind of rutiles should be above 10 μm.