Several researches have shown the bottom electrode can strongly affect the physical properties of thin film. However, they seldom involve with the domain switching performance. Here we investigated emphatically the effects of bottom electrodes LNO and Pt on the domain configurations of (Na0.85K0.15)(0.5)Bi0.5TiO3 (NBKT15) thin films using piezoresponse force microscopy. In comparison with the NBKT15 thin film on Pt electrode, the NBKT15 thin film on LNO electrode shows better performance in crystalline and electrical properties. Moreover the domain configuration of single grain within the NBKT15 thin film on LNO electrode is easier to be reversed under the electric fields, due to the larger grain size. Furthermore, we adopted the domain switching criterion from the perspective of equilibrium state free energy of ferroelectric nanodomain to explain the mechanisms of electric-generated domain switchings. (C) 2016 Elsevier B.V. All rights reserved.