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The life cycle cost of a device is the total amount of expenses incurred throughout its entire life cycle, from research and design, manufacturing, installation, commissioning, operation, maintenance, repair, renovation, to disposal. It mainly consists of acquisition costs and maintenance costs. The purchase cost is a one-time investment, which is why it is also called a non-recurring cost ； Maintenance costs are the expenses incurred during use related to personnel, power, materials, etc., needed for operating and maintaining the equipment; they are also known as reproduction costs. Equipment life-cycle cost = Purchase cost + Maintenance cost + Dismantling cost – Residual value (1) Purchase cost. Its direct costs include: development planning fees and market research fees ； Design fees, patent royalties ； Manufacturing penetration ； Shipping fees, storage fees ； Costs for operation and maintenance drawings and documents ； Training costs for operators and maintenance staff, as well as costs for training facilities. Indirect costs include: book and material expenses, computer processing fees, personnel management expenses, and contract-related costs. (2) Maintenance fee. Its direct costs include operating expenses, maintenance costs, logistics expenses, and disposal costs. Operating costs include: operator fees and support staff fees ； Costs for electricity, gas, oil, steam, and other forms of power ； Costs for consumable materials and air conditioning. Maintenance costs include: costs for maintenance materials and spare parts, labor costs, tool and equipment costs, and costs for equipment modification. Logistics costs include: storage fees for spare parts and maintenance materials, as well as rental fees for testing equipment. Indirect costs include handling fees, investigation fees, office expenses, etc.