This study numerically analyzes the sensitivity of displacement/strain/stress mode shapes to detect and locate structural damage on the marine propeller blade. The displacement mode shape change technique was used to assess the ability of displacement mode shapes to detect and locate single or multiple damages in a marine propeller blade. This technique is based on the comparison of normalized displacement mode shapes between undamaged and damaged states of marine propeller blades. Displacement/strain/stress mode shapes were obtained by modal analysis, and structural damage was introduced into the finite element model of the propeller blade by reducing the elastic modulus of the damaged element. Finally, numerical results of the damage identification index have been presented for single and multiple damage cases, and some observations on the sensitivity of displacement/strain/stress mode shapes to structural damage have been discussed.