对三号伟晶岩脉某些不相容元素的分异与演化进行了研究，结果表明，岩浆作用中的不相容元素Nb、Ta的不相容性在花岗伟晶岩浆演化过程中已大大减弱，Nb、Ta独立矿物如铌钽铁矿、细晶石等能形成于伟晶质熔体的各个演化阶段。依据地质观察和分析数据对三号伟晶岩脉的分离结晶过程进行恢复。同时，计算了Nb、Ta在熔体与白云母、微斜长石、钠长石、锂辉石等主要矿物之间的分配系数，对Nb、Ta的成矿作用也进行了讨论。 The differentiation and evolution of some incompatible elements in Pegmatite No.3 are studied. The results show that the incompatibility of incompatible elements Nb and Ta in magmatism during the evolution of granitic pegmatite Has greatly weakened, Nb, Ta independent minerals such as niobium tantalite, such as fine spar can be formed in the pegmatite melt in all stages of evolution. Based on the geological observation and analysis data, the separation and crystallization process of No.3 pegmatite vein was recovered. At the same time, the distribution coefficients of Nb and Ta between the melt and the major minerals such as muscovite, micro plagioclase, albite and spodumene were calculated and the mineralization of Nb and Ta was also discussed.