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Electrode lies in the front of the Electrical impedance tomography (EIT) system and contacts with human body directly. It is one of the most sensitive and the pivotal parts of EIT system. The type and the configuration of electrode system influence the reconstruction image greatly, especially for the central area of body, where the measurement sensitivity is very low. A simulation platform is developed to optimize the electrode structure parameter based on the coercive equipotential nodes model for the imaging object of the deep area of body. The influences on the measurement sensitivity and the image reconstruction quality have been studied using different electrode types and configurations. The simulation results suggest that optimal selection of electrode types and configurations can helpfully increase the image quality and measurement sensitivity of the image especially in central area. Several type and configuration parameter of EIT electrode that fit for central object imaging are also presented.