Directionally solidified Ni-base superalloys with high volume content of Al, Ti are considered unrepairable by traditional welding methods due to its high crack susceptivity to heat input. By strictly controlling the laser parameters, however, sound deposition layers were achieved free of cracks. It was also characterized by directional solidification which was not affected by heat treatment process. Large amounts of secondary γ′ particles were precipitated during heat treatment which greatly influenced the mechanical performance of the deposited layers. The tensile tests both of room temperature and 900 ℃ indicated that the tensile strength of the deposition layers after heat treatment can reach 80% of the base material and the fracture were ductile. The mechanical performance of the deposition layers can meet practical need of industrial use.