Aiming at the requirement of low speed impact localization, a fiber Bragg grating (FBG) sensor network is constructed. Distribution of the correlation dimension as well as the distance between the impact point and the sensor are studied, taken the correlation dimension with the impact response signal time series as an impact characteristic. Based on this distribution, the impact load position is regionally identified; the coordinated localization conducted by tri-circle model is achieved. The wing box structure is divided into several areas, where the configuration of FBG sensors is optimized according to the algorithm characteristics. As a result, the impact monitoring system is built and the low speed impact test is carried on. The result shows that the ten testing random impact points on the 30 cm×30 cm wing box plate structure are all identified correctly with an average error of 3.5 cm. The impact load position identification using six FBG sensors is effectively realized in this method, providing a reference for combination of fractal theory with impact monitoring technology.