Abstract: Al3(Ti0.5Zr0.5)p/6005A composites were in-situ synthesized under high-frequency magnetic field by direct melt reaction using K2TiF6, K2ZrF6 and Na3AlF6 as reactants. By means of scanning electron microscopy, X-ray diffraction and tensile testing machine, the microstructure and properties of the composites were investigated. The results show that the in-situ synthesized particles under magnetic field were fine Al3(Ti0.5Zr0.5)p particles, whose average size was 1-3 μm and dispersively distributed in Al substrate. At magnetic frequency of 2 MHz, the yield strength, tensile strength of the composites were 279.4 and 305.8 MPa, which increased by 7.1% and 8.7% compared with that of the substrate. And the elongation was 9.5%, which decreased by 10.1%. The fracture characteristics of the composites transformed from ductile fracture of the substrate to mixing fracture.