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The historical study of the Petroleum Contract improve that the Petroleum Contract is emergence of the conflict of interest of the Host country and foreign company. The conflict which is actually is transformed into collaboration in the Petroleum Contract.In order to determine this tendency to collaboration and distribution of interest and risks between the Host country and foreign company we shall focus at first on the general specification of the Petroleum Contract enabling us to specify the particularity of the Petroleum contracts which has the predominant effects on the method of the distribution of the interests and risks in exploration, development and exploitation of the petroleum in the Petroleum Contract.