Abstract: Emotional energy and related parameters describing emotional state were analyzed based on the psychological energy of psycho-dynamics. An emotional energy distributing configuration model and an emotional state probability description space were studied according to the energy balance law. The hidden Markov chain algorithm of excitation transition process was implemented to specify emotional state transferring process. By means of MATLAB simulation, the changing law of emotional state was further studied. Finally, a comprehensive research platform of emotional robot heads was built. It was also found that the results simulated by the emotional energy model were in perfect agreement with the experimental ones of an emotional robot head, demonstrating the validity of the model.