To realize laser gradient modified destressing restoration of aerial titanium alloy impairment, experiments of functionally gradient reparative layers (FGRL) and non functionally gradient layers (N-FGL) on Ti600 substrate by pulsed Nd:YAG have been carried out. The microstructures and elementary distribution regularities of FGRL are investigated. The thermal shock and thermal fatigue properties of FGRL and N-FGL are examined contrastively. It is found that a rapidly solidified microstructure consisted of in situ synthesized TiC reinforced phase distributed on FGRL in the form of globular grains has three main different shapes: bulky or imperfect arborescent crystal, fine or approximately equiaxial crystal and chopped fibriform crystal. With the increasing of original Cr3C2 content, the number and size of arborescent crystal increase obviously. Resisting thermal shock and thermal fatigue properties indicate that gradiently transitional components of FGRL can relax thermal stress effectively. The main surface oxidation morphology of FGRL possesses densely fine fibrous crystal. Otherwise, that is uniformly polygonal and crassitude TiO2 crystal to Ti600.