The 5.12 Wenchuan Earthquake caused damage and destruction to the Canon tower of the Peacock Cavity in the Anyue Grottoe.The aim of the project is to repair damage caused by the earthquake,to restore the frame,to reinforce the structure,and to decrease the effects of natural aging.Due to the unexpected destruction and the resulting rescue demands,this mapping and preservation project was completed in only one month.The three dimension LASER scan technology was introduced from the beginning.Thus,through application of computer simulation technology,the computer simulated rebuilt tower model can accurately assess the destruction of the Canon Tower and determine the original location of each damaged component.Together with structural calculation,these data provided a reference for final decision regarding the preservation plan.The application of three dimension Laser Scanning and computer simulation was successful and stands as a milestone for the investigation and preservation design for stone relics.It represents a useful technique for scientific heritage conservation.