We assume that the decision-maker can sell the used equipment after paying a transaction cost when he no longer needs it, and that the transaction costs are linear to the price. Our analysis shows that the optimal timing of online algorithm with considering the profit selling used equipment is earlier than that of online algorithm without considering it, and that the real competitive ratio of online algorithm is more than the nominal competitive ratio if the transaction (buying and selling) costs are included in the cost buying the equipment when the decision-maker designs online algorithm.%在设备寿命周期内,购买和使用结束后出售旧设备需要支付交易成本,交易成本与设备价格具有线性关系.分析显示:对于具有线性交易成本的耐用性设备在线租赁问题,如果不考虑在设备使用结束后出售旧设备的残值以降低成本,从租赁模式转换到购买模式的在线策略的转换时机,总是晚于考虑在设备使用结束后出售旧设备的在线策略；如果不考虑购买和使用后出售的交易成本,在线策略名义上的竞争比小于实际竞争比.
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