Proposed the idea of using causal analysis of the abnormal stock price volatility in Chinese stock market. By analyzing the relationship between Specially treated stocks’ abnormal fluctuations and listed Companies issuing assets reorganization notice, in Chinese stock market, Specially treated listed companies determine the reorganization of assets by issuing a notice which resulting in three consecutive up limit to control the stock price. In the course of reorganizing the assets, there is insider information. After three consecutive up limit in the stock prices, the company was forced to announce news.