With the production function and cost theory, the energy demand function was built, and the energy demand functions of China in 1979 - 2000, 1979-1992, and 1993 - 2000 were estimated.
利用生产函数和假定成本最小化建立了能源需求函数，并对1979～2000，1979～1992和1993～2000年中国能源需求函数进行了估计。
And take further steps to analysis whether obtain these functions and production cost is about equal on value. The results of study can provide some information for modern food package design.
以及实现这些功能与消耗的成本是否相当，通过分析为食品包装设计提供依据。
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