Abstract: High volume fraction(45%) SiC_P/2024 aluminum matrix composite was jointed by laser in-situ welding method with a Ti foil as intermediate material,the welded joints fracture behavior under different welding conditions was compared in this paper.The results indicated that,the Ti foil intermediate thickness of 0.5 mm was more favorable to form sound bead appearance and interfaces morphology.The tensile strength of joints was up to 50% of the base materials when the fracture occured at the centre of weld,which was quasi-cleavage fracture mode.When the Ti foil intermediate thickness increased up to 0.8 mm,the weld was very susceptible to porosity,lack of fusion defects,and insufficient interfacial reaction,the fracture location always occured at the interface,the tensile strength was lower,which was brittle fracture mode.