In the present study, the effect of two defect types including both interlaminar delamination and crack on the vibration properties of the curved laminated composite panel is investigated. First, the experimental test was performed on the samples and after confirming the finite element model with the test results and articles, using the obtained finite element model, to investigate the effect of the dimensions of both defects, the increase in the number of defects, the position of the relative to each other and in Finally, the defect effect of longitudinal and transverse cracks has been investigated by keeping the position and dimensions of interlayer separation constant. The important outcome is that the fundamental frequencies are reduced as the stiffness is decreased due to the presence of both defect types. Delamination defect has less effect on the natural frequencies of multilayer composite. Also, the effect of the transverse crack on the first mode of the structure is more evident than the separation between the layers, and the location of the defects in the center of the plane has a greater effect on the frequency.