With the case of Gansu Province, using data from 1978 to 2012, this paper studies the determinants of power demand with the methods of co-integration theory and error correction model, constructs a power demand function, and tests the long-run equilibrium relationship and short-term fluctuation relationship between aggregate power demand and the main economic variables, such as GDP, price, economic structure and efficiency.%以甘肃省1978-2012年数据为例，采用协整与误差修正模型技术研究了甘肃省电力需求的决定因素，建立了甘肃电力需求函数，检验了电力需求与国内生产总值、电力价格、经济结构、电力使用效率之间的长期均衡关系及短期波动关系。
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