Highly evolved granites are generally related to W,Sn, Nb-Ta and REE mineralization in the Nanling Mountain area. According to the REE distribution patterns, they can be divided into three categories: (1)normal; (2)HREE-enriched and( 3 )REE-depleted, and show fractional trends from earlier to later stages in multiphase intrusive complexes. Simulating calculation's by using the available theoretical models reveal that several processes, such as batch partial melting, fractional crystallization and combined fractional partial melting and crystallization (Wetzel et al., 1989), might be responsible for the evolution of the magmas, during which accessory minerals, such as sphene, apatite, allanite,monazite, xeno-time, zircon and garnet, play the most important role in REE fractionation.Such complex processes lead to the conclusion that one must be cautious when using REE distribution patterns as tracers for interpretating the genesis of granitic magmas.