To investigate the fatigue performance of fiber reinforced resin matrix composites under tensile loads， carbon fiber/epoxy resin laminates were fabricated.Tensile fatigue tests were conducted under four different stress levels， and the stress-logarithmic life （S-lgN） curves were plotted.Ultrasonic C-scanning，ultra-depth-of-field 3D microscopy，and scanning electron microscopy （SEM） were employed to observe the internal damage and fracture morphology.The fatigue damage propagation and fracture modes of fiber reinforced composites were discussed.Meanwhile，a model suitable for simulating the fatigue behavior of fiber reinforced composites was established，which could well predict the fatigue life of laminates and efficiently simulate the fatigue damage evolution.Both experimental and simulation results indicate that：in the initial stage of fatigue，damage mostly initiates in the form of cracking；in the middle stage，damage is dominated by delamination and cracking；in the final stage，the damage forms become complex and interact with each other.Delamination，cracking and other types of damage tend to reach saturation，interfacial instability occurs，fibers fracture in clusters，and the material is on the verge of fatigue failure.