Abstract: Information fusion is introduced to enhance the accuracy of damage detection with multi sensors.In the damage information fusion for character level,the concept for integral support vector machine damage detection matrix,damage self-information and damage information entropy are presented.The structure is divided into multiple substructures,the data acquisition and support vector machine are established for each substructure in order to form integral SVM damage detection matrix.In the damage information fusion for decision level,the methods based on fuzzy set theory,material element theory and fuzzy neural network are studied.The results,proven by a numerical example of space structure,show that the methods are valid and effective.