Ferroelectric properties of Bi doped (Ba 1 − x Ca x ) 0.925Bi 0.05TiO 3 (Bi–BCT, 0.10 < x < 0.30) ceramic prepared by the solid-state technique have been studied. An interesting double-like hysteresis ( P–E) loop at room temperature (300 K) with the remarkable linear dielectric response was observed over a certain electric field range. Room temperature P–E loops before and after de-aging, as well as those at different values of field cycling, could exclude the possibility that the double P–E loops might result from the antiferroelectric components and the electric field induced paraelectric–ferroelectric ( PE–FE) transition near Curie temperature ( T c ) in Bi–BCT, and verify that there exists a diffusional aging effect in Bi–BCT. A symmetry-conforming short-range ordering (SC-SRO) of point defects is suggested to be responsible for the observations of the interesting double-like P–E loop in Bi–BCT.