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：This research studies damage location detection of fiber-reinforced composite thin plate based on laser scanning method. The laser scanning frame model of the composite plate is established, and when the extraction principle of modal shape data is illustrated, two-dimensional five-spot-tripling surface smoothing method is proposed, so that a quantitative index for damage location detection of fiber-reinforced composite thin plate, i.e., the damage location index can be derived. The Matlab calculation program is written, and the specific damage location detection procedures of composite plate based on laser scanning method are also proposed. T300 fiber/epoxy composite plate is taken as a study object, and damage detection experiment is performed based on the established laser scanning vibration testing system. It has been proved that the above method can detect fiber breakage position of such composite plate with high accuracy, and this method and the related experimental system can provide a new idea for damage detection and identification of composite structures. Key words：fiber-reinforced composite plate；two-dimensional five-spot-tripling surface smoothing method；damage location detection；laser linear scanning；experimental study 0 前言* 纤维增强复合材料比强度高、比模量高、热稳 定性好， 还有一定的阻尼减振能力。 目前， 以 TC300、 TC500 和 TC800 等为代表的先进碳纤维/树脂基复 合材料正在被越来越多地应用于航空、航天、汽车