A method for a wireless data terminal to support an Internet Protocol Version 4/Internet Protocol Version 6 (IPv4/IPv6) dual stack is described, including: the wireless data terminal maps a Modem port and a Network Driver Interface Specification (NDIS) port at a user terminal; and the wireless data terminal receives an instruction for establishing a network connection, initiates a Packet Data Protocol (PDP) context activation request to a network which a user expects to connect, and establishes the network connection according to the mapped port, after the network successfully responds to the PDP context activation request. Simultaneously, a wireless data terminal supporting an IPv4/IPv6 dual stack is described.