Abstract: In 2009 China′s dependence on oil imports has surpassed 50%.In order to defend our oil security，various measures have been taken which range from the implementation of energy cooperation with foreign countries to development and exploitation of new energies.After a great deal of investigation the authors suggest maintaining China′s oil security and guaranteeing normal supply of oil resources in the following ways：enhancing domestic oil exploration and exploitation by introducing competition mechanisms，establishing a diversified oil energy system，establishing a fair and free energy market by joining IEA，improving our safety management system of oil，etc.

Key words: oil security, dependence on oil imports, security strategy, oil consumption, oil energy system