A large number of magmatic rocks were formed in the Gangdese belt of the Qinghai-Tibet Plateau. To better understand the petrogenesis, magma source region and evolution, we have studied the petrography, geochemistry, zircon trace elements and Hf isotope analysis of the granite porphyry and rhyolitic crystal tuff in Mamu, Gakyi, western of the Central Lhasa Terrane. The granite porphyry and rhyolitic crystal tuff in Mamu were both formed at Early Cretaceous period. They are both shoshonitic rocks, enriched in large ion lithophile elements, and light rare earth elements, and depleted in high field-strength elements(HFSE) and Eu. They have high negative εHf(t) values of -9.57~-3.43 and -8.79~-4.80, and the older Hf isotopic crustal model age t_DM2 of 1 774~1 388 Ma and 1 727~1 477 Ma, respectively. The Early Cretaceous magmatic rocks originated from the remelting of ancient lower crustal materials, with the mixing of mantle material. After the magma mixing, the amphibole, feldspar and biotite were first separated and crystallized, finally formed the granite porphyry and rhyolitic crystal tuff. Combined with previous studies and this paper, we infer that the Early Cretaceous magmatism in Mamu is probably due to the southward subduction of the southward subduction of Bangong-Nujiang suture zone.