Daguzhai and Luobuli granites occur as two small bodies of different genetic types. On the basis of field investigation and the study of petrology, petrochemistry and rare-earth elements as well as characteristics of strontium and oxygen isotopic compositions, it is believed that the Daguzhai granite is formed by the transformation of the upper caustal material through remelting, while the Luobuli monzogranite is generated by mixing of the mantle magma and the crustal materials basd on the data of inclusion thermometry and biotite chemical analysis, their crystallization conditions and emplacement depth are estimated. Besides,the genesis of andalusite and sillimanite in the Daguzhai granite is discussed on the basis of thermodynamic theory and geo- logical occurrence.