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Gray theory that the behavior of the system even though the phenomenon is dim, the data is complex. Gray theory is to generate data model, not the original data model. The so-called gray system is a transition system is between the white and the black box system system, its specific meaning is: If all the information about a system known as the white system, all the information is unknown for the black box system, some of the information is known, some of the information unknown, then this system is a gray system. Generally, social systems, economic systems, ecosystems are gray systems. For example the price system, a lot of factors that lead to price increases, but not much is known, and therefore the price of the gray system prediction method can predict with gray. Grey system theory is that information on both a known or unknown determining system also contains information to predict, is the change in a certain position, the process time-related gray forecast. Although the phenomeno