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在有效的股票市场上，价格是资金供求的准确信号，价格对相关信息能做出充分及时的反映。吴世农［２］利用上市股票价格的自相关系数实证检验了深圳股票市场的弱有效性，结论是深圳股票市场不是弱有效的。本文首先指出利用自相关系数进行检验的不合理性，然后给出了ＤＦ检验，最后利用１９９５年７月至１０月４个月的每日股票收盘价检验了５种上市公司股票，它们都满足弱有效性
In the effective stock market, the price is the accurate signal of supply and demand of funds, the price can make the relevant information fully and timely reflected. Wu Shennong [2] used the autocorrelation coefficient of the listed stock price to test the weak validity of the Shenzhen stock market, and concluded that the Shenzhen stock market is not weak and effective. This paper first points out the irrationality of using the autocorrelation coefficient to test and then gives the DF test. Finally, using the daily closing prices of stocks from July to October in 1995 to the five stocks of five listed companies, all of them satisfy Weak effectiveness