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The rubber circular plate is considered as a kind of membrane. Based on the character that there existsno bending-moment inside a membrane, the geometric behavior of the rubber circular plate in expanding state wasdescribed with the aid of a group of mathematic method. The relationship between deflection and load was attainedby means of calculating stress and strain inside the curved-surface of rubber plate. Meantime, based on Henckymethod, the relationship between deflection and load was attained and considered as the Hencky solution. The dif-ferent results given rise by the two different resolving methods were compared. The deviation results from theHencky method was discussed, and a kind of correcting method was put forward.