The thermographic approach is used to rapidly determine the fatigue properties of composite materials. A modified fatigue life prediction model based on self-heating data and stiffness degradation applied to unidirectional and ±45° CFRP (Carbon Fiber Reinforced Polymer) composite under traction loading (R=0.1) been developed in order to avoid the conservativeness on the fatigue life of a quasi-isotropic CFRP laminate. In this work, the original model is modified by introducing a new parameter r to take more complex damage mechanisms in MultiDirectional (MD) laminates into account. It is demonstrated that predicted S-N curves using modified model has a better agreement with the experimental results.