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Electromechanical bending actuation of chitosan-blended cellulose (CBC) electroactive paper (EAPap) was studied using a theoretical model, followed by an experimental comparison. The bending displacement of the model was calculated based on an ion traveling phenomenon and multilayered cantilever beam. By comparing the bending model and experimental data, we found that the bending model could predict the electromechanical actuation behavior as well as redistribution of ions inside of CBC EAPap under different humidity levels and electric fields. The bending actuation model of EAPap can be useful to investigate the electromechanical actuation behavior of EAPap devices such as artificial muscles, microrobots, and other various actuators.