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publisher[Abstract] Recently, the outbreak probability of main big size earthquake occurred at the plate borders such as Tokai Earthquake, Tounankai Earthquake, Nankai Earthquake, increase in Japan. It is very significant for social needs to predict the outbreak of the big size earthquake in such situation. In this report, we suppose that several medium/small size earthquakes are related to the outbreak of the big size earthquake, and we will speculate about the hypocenter and the outbreak time of the big size earthquake by analyzing the data of the medium/small size earthquake occurred in Japan two years ago. Furthermore, we would try to predict the outbreak of Tokai Earthquake, Tounankai Earthquake, Nankai Earthquake from this results