A domain name system, DNS, resolution processing method, comprising the steps of: writing, by a router, a primary domain name system, DNS, resolution server IP address obtained through dialing, into a secondary DNS resolution server IP address parameter of a dynamic host configuration protocol, DHCP, server process configuration file; and receiving, by the router, a DHCP request from a terminal and assigning the primary DNS resolution server IP address of the router to the secondary DNS resolution server IP address of the terminal, characterized in that the step of writing, by the router, the primary DNS resolution server IP address obtained through dialing into the secondary DNS resolution server IP address parameter of the DHCP server process configuration file comprises: initializing a configuration parameter modification flag bit of the DHCP service process; closing the DHCP service process, and writing the obtained primary DNS resolution server IP address into the secondary DNS resolution server IP address parameter of the router DHCP service process; setting the configuration parameter modification flag bit of the DHCP service process to be a specified value; detecting whether the configuration parameter modification flag bit of the DHCP service process is the specified value, if so, restarting the DHCP process and resetting the flag bit. writing, by a router, a primary domain name system, DNS, resolution server IP address obtained through dialing, into a secondary DNS resolution server IP address parameter of a dynamic host configuration protocol, DHCP, server process configuration file; and receiving, by the router, a DHCP request from a terminal and assigning the primary DNS resolution server IP address of the router to the secondary DNS resolution server IP address of the terminal, characterized in that the step of writing, by the router, the primary DNS resolution server IP address obtained through dialing into the secondary DNS resolution server IP address parameter of the DHCP server process configuration file comprises: initializing a configuration parameter modification flag bit of the DHCP service process; closing the DHCP service process, and writing the obtained primary DNS resolution server IP address into the secondary DNS resolution server IP address parameter of the router DHCP service process; setting the configuration parameter modification flag bit of the DHCP service process to be a specified value; detecting whether the configuration parameter modification flag bit of the DHCP service process is the specified value, if so, restarting the DHCP process and resetting the flag bit. initializing a configuration parameter modification flag bit of the DHCP service process; closing the DHCP service process, and writing the obtained primary DNS resolution server IP address into the secondary DNS resolution server IP address parameter of the router DHCP service process; setting the configuration parameter modification flag bit of the DHCP service process to be a specified value; detecting whether the configuration parameter modification flag bit of the DHCP service process is the specified value, if so, restarting the DHCP process and resetting the flag bit.