<p>The damage behaviors and load-bearing capacity of composite rotor blade airfoil structure were analyzed and predicted under quasi-static and fatigue loadings. Firstly, a high-fidelity finite element model of the typical section of the composite rotor blade airfoil structure was established and validated through experimental results. Subsequently, based on the fatigue residual strength model and Hashin criteria, modified fatigue and static progressive damage model and algorithm were developed to predict the quasi-static and fatigue damage behaviors of the composite rotor blade airfoil structure. The results showed that under quasi-static loading, the ultimate quasi-static load-bearing capacity of the composite rotor blade airfoil structure was 3.08 times the test quasi-static load. The damage is primarily concentrated in the woven composite materials at the rear part of the airfoil structure. Under the condition of about 500,000 fatigue cycles, the airfoil structure can withstand about 1.5 times the test fatigue load, and the damage is mainly concentrated at the main beam at the leading edge and the small beam in the middle of the airfoil structure. Although other components of the airfoil structure have not been damaged, some have shown a significant decrease in material strength. The findings of this study provide a foundation for optimizing the structural strength design of composite rotor blades.</p>