Abstract: An optimization technology was adopted to reconstruct the loads applied on the advanced composite grids structure （AGS）. Based on the forward response model built in literature 11，a figure of merit J was defined to measure the difference between the calculated response and the measured response. Thus，the inverse problem was converted to searching for inputs that satisfy the minimization of the defined J. Smoothing arithmetic was adopted to the solving and power gradient cloud together with the extreme point of figure of merit J was utilized to guide the searching for the load location. Therefore，a set of methods of load reconstruction are put forward，including location determination and load history recovering. The results of the numerical example and the physical experiment indicate that the methods proposed in this paper run stably and accurately，which provides the necessary techniques for engineering application of AGS.