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After-sales support of equipments has the trend of shifting to the performance-based support pattern gradually. This paper studies control polices on transportation equipment support system under performance-based contract, analyzes the spare parts loss characteristics and presents the optimal control polices in different simulation situations. Firstly, the steady-state probability distributions of inventory level at spare parts warehouse are derived and several important performance measures are obtained, such as system availability. Then an optimization model with performance constrained is setup and an efficient genetic algorithm is proposed. Finally, several numerical experiments are performed. The results shown that the average time between failures has much more effect on the optimal control strategy than the repair rate of the spare parts. 