作为电力板块中的一支高成长绩优股，公司股票长期 稳居深圳 100指数成份股和沪深300指数样本股行列 。

As the power plate in a high-growth blue chip stocks, shares a long-term top in Shenzhen 100 index constituent stocks and shares in Shanghai and Shenzhen 300 index ranks of the samples.

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其次进行研究设计，提出研究假设，并且构建相对应计量模型，选取2005——2006年上证180样本股中156个A股企业作为有效研究样本。

Then it makes a design, puts forward hypothesis, constructs relevant model and selects 156 A-share enterprises of Shanghai stokes market 180 sample share during 2005-2006 as a research sample.

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