Dioritic enclaves were discovered by the authors in the subvolcanic rock dike of the northern part of the large collapse volcanic basin in Xiangshan, Jiangxi Province. These enclaves have a typical back vein and a quenched margin,and contain a large number of acicular apatites. Potassium feldspar and plagioclase xenocrysts are seen within these enclaves and the boundary between the host rock and the enclaves. These xenocrysts are trapped from the host magma by the enclave magma and are frequently resorbed into a round and sieve shape. There are many similarities of the REE distribution patterns and incompatible element patterns between the enclave and the host rock ( subvolcanic porphyric granodiorite ). Therefore , the quenched dioritic enclaves in subvolcanic granodiorite in Xiangshan were formed by the convection of the magma with different composition and temperature and by the heterogeneous mingling between them. These enclaves are genetically quenched enclaves.