Crystal mush rejuvenation is capable of magma differentiation, evolution, migration, and mixing and magma mixing may act as a trigger for crystal mush rejuvenation. The Jialuhe Composite Pluton in the eastern part of East Kunlun Orogen, northern Tibet Plateau, is a product of magma mixing that contains abundant mafic microgranular enclaves (MMEs) that often form dike–like clusters in the central parts of the pluton that is composed of porphyritic amphibole granodiorite containing medium– to coarse–grained amphibole crystals and fine–grained biotite, whereas the external zone consists of biotite granodiorite with dominant biotite accompanied by a small fraction of amphibole. Amphibole aggregate bands developed within the MMEs consist of densely packed amphibole megacrysts. We selected amphiboles from the MMEs, host rocks, and amphibole aggregate bands to study mush rejuvenation triggered by magma mingling. The amphibole megacrysts are euhedral and show zoning from cores to rims with decreasing in Si, Mg, and Na, and increasing in K, Al, Fe, and Ca. We have classified these amphibole megacrysts into three types according to their different rare earth element concentration zoning from cores to rims, which reflect recharge of dioritic magma and the final chemical equilibrium in the melt. The physicochemical crystallization conditions of the three types of amphibole megacrysts in the amphibole aggregate bands indicated that the temperature and oxygen fugacity decreased, while the pressure and water content in melt increased during amphibole crystallization. These results combined with petrography, suggest that injection of dioritic magma gave rise to the MMEs and transferred heat and water to the host granitic mush. This transference resulted in coarsening of amphiboles in the host mush, especially within the granodiorite patches encaged within the MMEs, where the coarsened amphiboles joined to forming the aggregate bands. Therefore, these bands are a good indicator of crystal mush rejuvenation caused by the combination of heat and introduction of water, but the rejuvenation process was limited and local. Recharge of mafic magma in transcrustal felsic mush systems could not rejuvenate the entire felsic magma reservoir, but only parts near the mafic magma recharge channel.