To better understand the material properties of bismuth layer structured ferroelectrics (BLSF) ceramics, the piezoelectric properties of BLSF ceramics have been investigated as a function of mechanical loading. Piezoelectric properties, such as the piezoelectric constant  and electrostatic capacity  decrease non-lineally with increasing cycle number and applied stress. Such a change of material degradation is influenced by the severity of the material damage in the BLSF ceramic. The value of the critical damage at the sample final fracture point due to cyclic and static compressive loading can be determined by proposed exponential and polynomial expressions. It appears that the failure of BLSF ceramics occurs even with a low damage variable below 0.10.