Abstract: The present invention discloses a method and device for transmission self-configuration in a Self-Organized Network (SON), said method includes: a Dynamic Host Configuration Protocol (DHCP) client reporting a device identifier of this DHCP client to a DHCP server; said DHCP server configuring a transmission parameter for said DHCP client according to said device identifier, and sending said transmission parameter down to said DHCP client, said transmission parameter at least including an IP address of said DHCP client; and said DHCP client performing self-configuration according to said transmission parameter. The present invention uses the device identifier to allocate a fixed IP address, which is able to overcome the drawbacks caused by using the MAC address to allocate the fixed IP, and has a very strong maintainability.