A method for transmitting keepalive information, the method comprising: transmitting, by a terminal, first information to a network device, wherein the first information is used to instruct the network device to determine keepalive information to be received; and transmitting, by the terminal, the keepalive information to the network device, wherein the network device is configured to optimize the keepalive information the method characterized by: reporting, by the terminal, a signaling optimization function indication to the network device, wherein the signaling optimization function indication is used to indicate whether the terminal has a capability of reducing the frequency of transmitting the keepalive information, so that the network device makes a duplicate of the keepalive information or forges a piece of keepalive information, and meanwhile starts a timer and a counter, forwards the keepalive information to an SGSN or a GGSN after a duration of the timer expires, and delivers configuration parameters for signaling optimization by using dedicated signaling or a broadcast message when the network device knows, according to the signaling optimization function indication, that the terminal has a capability of reducing the frequency of transmitting the keepalive information; and when the terminal has the capability of reducing the frequency of transmitting the keepalive information, obtaining, by the terminal, the configuration parameters for signaling optimization preconfigured or delivered by the network device; wherein the transmitting keepalive information comprises: transmitting the keepalive information according to a transmission frequency indicated by the configuration parameters for signaling optimization. transmitting, by a terminal, first information to a network device, wherein the first information is used to instruct the network device to determine keepalive information to be received; and transmitting, by the terminal, the keepalive information to the network device, wherein the network device is configured to optimize the keepalive information the method characterized by: reporting, by the terminal, a signaling optimization function indication to the network device, wherein the signaling optimization function indication is used to indicate whether the terminal has a capability of reducing the frequency of transmitting the keepalive information, so that the network device makes a duplicate of the keepalive information or forges a piece of keepalive information, and meanwhile starts a timer and a counter, forwards the keepalive information to an SGSN or a GGSN after a duration of the timer expires, and delivers configuration parameters for signaling optimization by using dedicated signaling or a broadcast message when the network device knows, according to the signaling optimization function indication, that the terminal has a capability of reducing the frequency of transmitting the keepalive information; and when the terminal has the capability of reducing the frequency of transmitting the keepalive information, obtaining, by the terminal, the configuration parameters for signaling optimization preconfigured or delivered by the network device; wherein reporting, by the terminal, a signaling optimization function indication to the network device, wherein the signaling optimization function indication is used to indicate whether the terminal has a capability of reducing the frequency of transmitting the keepalive information, so that the network device makes a duplicate of the keepalive information or forges a piece of keepalive information, and meanwhile starts a timer and a counter, forwards the keepalive information to an SGSN or a GGSN after a duration of the timer expires, and delivers configuration parameters for signaling optimization by using dedicated signaling or a broadcast message when the network device knows, according to the signaling optimization function indication, that the terminal has a capability of reducing the frequency of transmitting the keepalive information; and when the terminal has the capability of reducing the frequency of transmitting the keepalive information, obtaining, by the terminal, the configuration parameters for signaling optimization preconfigured or delivered by the network device; wherein the transmitting keepalive information comprises: transmitting the keepalive information according to a transmission frequency indicated by the configuration parameters for signaling optimization.