Abstract: Laser additive manufacturing is an ideal advanced manufacturing technique with high efficiency and high flexibility. Materials undergo a cyclic rapid heating and cooling process during laser additive manufacturing, producing severe residual stresses in metal components and leading to unpredictable deformation problems. This has become a bottleneck to restrict the development and application of the technique. The research status of deformation of metal components during laser additive manufacturing is reviewed from aspects of formation mechanism, testing methods, influencing factors and numerical simulation. The effects of laser power, scanning speed, scanning strategy, substrate preheating and other process parameters on deformation of metal components are described in detail. The prediction and control methods of the current additive manufactured product deformation are described. The future research direction of laser additive manufacturing deformation control is prospected.