The object of this study was to investigate the fatigue behaviors of angle-ply composites. Filament-wound specimens were fabricated using a epoxy resin with carbon and kevlar fibers wound at the angle, ±37°and ±53°, and tested in uniaxial tensile fatigue with 2 types of loading : sinusoidal and spike waveform. The hysteresis loop changes were examined. Contrary to the autoclaved-laminate, a cyclic stable state was never reached in this class of materials due to the presence of manufacturing induced defects. The cyclic loading modes indicated significant effects on the fatigue lifetime, fatigue induced creep curve, and temperature change depending on the orientation of fibers and material systems. During fatigue tests damage development was monitored by surface replica and Zinc iodide (ZnI₂)enhanced X-radiography, and fractured surfaces were studied using a scanning electron microscope (SEM). The failure processes in the two loading modes and fiber orientations were significantly different.