The tidal stress gives rise to cyclic strain, and then forms cumulative damages and fatigue fractures in crustal rocks. Three macroscopic geological characteristies of fatigue fracture are given in this paper. Many fatigue fractures, for example, the micro-structures, continental and oceanic tectonic systems, and structural joints in Quaternary soft deposits are analysed. The deformation lamellae in quartz may be fatigue micro-cracks. There also exists the relationship between the fatigue mechanism and the circum-Pacific seismic zone, or the sea floor magnetic anomaly patterns and tidal effect. A new model, cumulative damage-micro-body basalt intrusion along fatigue cracks-upper mantle upwelling along fatigue faults-ocean floor spreading, is shown. The fatigue-lifes of continental and oceanic crusts are suggested.