功能折旧是用成本法进行房地产估价时必须处理的问题，但目前尚无成熟的计算方法。

Functional depreciation is an important aspect to real estate appraisal, but there is no mature method so far.

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过去在进行技术经济评价或固定资产折旧时，由于缺乏一套具体计算方法，通常只有定性分析，而无定量计算。

Since we are short of a systematic methods in economic apprise of technique and depreciation of fixed assets, we used to do qualitative analysis, never did quantitative analysis.

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提出了一种基于当量行驶里程的二手乘用车折旧率计算方法。

A calculating method of depreciation factor of used cars based on equivalent total mileage is presented.

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