Rutile is a common accessory mineral in the Qianlishan biotite granite. In this paper, the authors investigated chemical significance of rutiles in tracing the magmatic-hydrothermal evolution and W-Sn metalogic process based on their typomorphic features. The results show that three forms of rutiles caused by the influence of the hydrothermal fluid can be identified. The first type of rutile occurs in the biotite fissure, being anhedral rutile, the second type is composed of euhedral crystals with relatively large grain size. The third type of rutile occurs as aggregates with banded and anisomerous structures. The continual increase of tungsten content of rutile with the enhancement of alteration and mineralization suggests that the tungsten content in the rutile can be used as a criterion for the ore-forming capability of granite, and the high tungsten-bearing rutile can indicate the formation and enrichment of the tungsten. In the future, these phenomena can be used as prospecting marks in search for tungsten deposits.