The generic method to determine equipment update occasion is the model of applying conception of equipment natural life, or technical life, or economic life in isolation. 常用的确定装备更新时机的方法是孤立地应用装备的自然寿命,或者技术寿命,或者经济寿命概念的模型。本文提出了基于装备的自然寿命、技术寿命、经济寿命概念的装备更新决策综合方法;