Abstract： On the basis of the achievements obtained in geological systemic investigation and analyzing geological characteristics, the authors mainly studied the strain characteristics, genesis and the ageof deformation of tourmalite-quartz enclaves. Three-dimensional finite strain measurement and strain analysis of tourmalite-quartz enclaves in Yuanbaoshan pluton were carried out successively. The results show that the three strain patterns of tourmalite-quartz enclaves are plane strain (K=1), flattening strain (0＜K＜1) and contraction strain (1＜K＜∞).The pattern of strain of tourmalite-quartz enclaves in Yuanbaoshan pluton is mainly plane strain,with minor flattening strain and contraction strain.