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The design of system reliability redundancy is an important method to improve system reliability. It is a difficult point to determine the redundancy numbers of each unit in the system in order to guarantee to satisfy the request of design reliability and the constraint of system cost. This paper discusses the strategical method of system reliability redundancy, and designs a kind of optimization model of system reliability redundancy, uses hybrid intelligent algorithm to solving the model. This method can make the system achieve the biggest lifetime at a certain probability under the certain expense constraint and gives a new way to solving the redundancy numbers of each unit, the experiment has proven that this method had a stronger suitability and solving ability.