Based on self-organizing criticality perspective, this paper probes into the internal dynamics mechanism of stock price fluctuation in China A-share market, and attempts to analyze the stock price fluctuation of the four listed express companies and the express industry composite index respectively. The results indicate that the fluctuation of stock price in Chinese express industry has self-organized criticality, and the stock price has long range correlation; it also shows that China's A-share listed express industry is in a process of benign development; based on that the express industry is faced with not only the inner problem of low service quality and extensive development but the external test of government strengthening supervision, it puts forward that the express industry should take the initiative to shift and maintain industry self-discipline from the perspective of sand-pile model.