In order to analyze the fatigue behavior of the center-cracked aluminum plates bonded one-sidedly with composite patches, a parametric program based on the ANSYS was developed. The stress intensity factor and its amplitude of the stress intensity factor of the bonded plates were calculated. The Paris equation, which can be expressed as da/dN = C(ΔK)^m, where, da/dN is the propagation rate of the crack and can be measured at specific fatigue cycles experimentally, is an amplitude of the stress intensity factor at the crack tip during a fatigue cycle, and can be obtained by FEM, was used. Results show that the Paris' parameters for the plate bonded one-sidedly with carbon fiber reinforced epoxy composite patches are C =6.76×10^-10and m =2.27, respectively, while for glass fiber reinforced epoxy composite patches, C =7.89×10^-10and m =2.33, respectively.