ZL114A casting aluminum alloy was repaired by laser deposition repair (LDR) using a fiber laser. Morphology analysis showed that the repaired region and the substrate form a good metallurgical combination. Under the control of temperature gradients and solidification rate, the microstructure of laser deposition layer transformed from columnar dendrites at the bottom of laser deposition layer into isometric crystal at the top of the last deposition layer. Tensile tests showed that laser deposition sample exhibited a superior tensile property, the tensile strength of the repaired region reaches 87.5% of Al alloy casting standard, and the elongation is much higher than that of Al alloy casting standard. Fracture analysis showed that the fracture mechanism of ZL114A casting aluminum alloy is brittle fracture, but the fracture mechanism of the repair zone is toughness fracture. Residual stress analysis showed that there exists the stress concentration issue, and the peak of residual stress locates in the joint between the substrate and the repaired region. After stress relief annealing, the residual stress of laser deposition samples decline by 10-23 percent.