Abstract: An e-commerce transaction system and method for intangible merchandises are provided. The system includes a web portal, a database, a security verification module, a network transmission interface and a server. The method includes the following steps. Firstly the user logs into the web portal to upload or download intangible merchandise, or a demand or an information for the intangible merchandise. The intangible merchandise, the demand and the information are stored in the database. Through the security verification module, login information, transaction procedures and the intangible merchandise are protected, encrypted and verified. The web portal is operated through the server and the network transmission interface.