Abstract: As carbon nanotube buckypaper composites have a good interfacial properties, conductivity, and thermal conductivity, they can be used for whole-life health monitoring of composite materials. In this paper, carbon nanotube buckypaper and its sensors have been prepared. Meanwhile, composites samples with the buckypaper sensors at different positions were obtained. Tensile loading and unloading tests were performed. By analyzing changes in the buckypaper resistance change rate and composite strain, a strain-sensing coefficient was obtained to clarify the synergistic deformation of composite materials. The results of this study demonstrate that buckypaper sensor can be used to monitor the tensile fatigue damage of composites.