The quantitative limits of rational debt of petroleum enterprise are calculated when total capital return ratio is higher or lower than debt capital cost respectively. A case of calculation is given.

结合石油企业的生产经营特点，分别提出了总资本报酬率高于或低于债务资本成本时石油企业合理负债率和负债额的数量确定方法，并给出了案例分析。

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