|dc.description.abstract||In the investment market, information is the key to the investors’ decision. It includes how to send out the company’s information fairly, to allocate the information the effectively to prevent insider trading, and to demonstrate「Corporate Governance」effectively. In order to clarify the components of insider trading, Securities and Exchange Law already regulated on how the actual content affects the stock price greatly, or the information about the investment decision of the investors. However, the range of crucial information can not be constantly the same. This thesis redefines the standard of information that affects the stock price and the consideration of the investors. Therefore, this thesis discusses the disclosure of information and insider trading as the basis of economic theory firstly. Secondly, the thesis introduces how our nation is affected by the theory and of foreign development, Taiwan’s disclose information of securities and disclose information of finance to prevent insider trading is integrated by current policies and suggested policies. Finally, the conclusion of the Taiwan’s case analysis gives scope of information disclosure ways of public information, formation times and prevention of insider trading, a new way of thinking.