Abstract: The coal enterprise network may be caused by internal network, external network, the Internet site Composition.Information preservation and the transmission is in need of protection, to ensure that only legitimate users can access these information,And unauthorized userscan't access the information.By using the public key infrastructure (PKI) can realize data encryption and user identity identification. In this paper, based on Windows 2003 platform introduced coal information security site(HTTPS) construction technology,It mainly involves the CA certificate, public key technology such as PKI, SSL.This paper assumes that the site environment on a