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For the failures of two-dimensional product affected by the calendar time and usage time, traditional one-dimensional preventive maintenance can’t meet the actual maintenance demand of two-dimensional product, therefore, according to the features of two-dimensional product, preventive maintenance strategy for two-dimensional product is proposed, this paper makes decision for two-dimensional product through calendar time and usage time. First we establish failure rate function expression of two-dimensional product and analyze the process of two-dimensional preventive maintenance in detail, after propose a cost model and availability model from the view of economy and mission in finite span. According to the cost and availability model, through examples, we derive the optimal two-dimensional age-replacement interval by cost-effectiveness analysis, and verify the model’s the applicability and the validity through contrast and analysis, verify that two-dimensional block-replacement strategy is better than traditional block-replacement strategy,the last we give a brief discussion of future research area about two-dimensional maintenance.