The amount of data transmission in Electronic commerce (E-commerce) is growing, and the security requirements are also increasing. During the data transmission, the data transmission module is divided into four parts, They are respectively: the Internal network, isolation module, and firewall and the untrust domain or external network. At the isolation module, the exchange isolation unit, data transmission unit, file transfer unit, and other units and engines, are set. The security is enhanced in e-commerce in many ways, the large flow of data transfer between different trust domains.