The effect of aluminum mole fraction and incident light intensity on linear, nonlinear, and total optical absorption coefficients in core-defected shell nanowire is theoretically investigated. The presented nanostructure is a cylindrical quantum wire including a defected shell around the cylinder core. Based on the density matrix approach and the effective mass approximation, the intersubband optical absorption coefficients are numerically calculated. The results show that the magnitude and peaks positions of optical absorption coefficients can be adjustable by varying aluminum mole fraction. The resonance peak positions of optical absorption coefficients are blueshifted by increasing of the shell region potential due to increasing of the energy difference between two energy levels.