Method and device for adjusting transmission layer parameter

The invention discloses a method and a device for adjusting a transmission layer parameter. An identifier of a network device included in a stream forwarding path serves as an index of a matched record, and thus, before a stream transmission end builds the stream or when the stream is transmitted, the stream transmission layer parameter is adjusted according to the acquired matched record for the transmission layer index. The method comprises steps: a first device determines the identifier of the network device included in the first forwarding path of the stream; the stream flows from the first device to a second device through the first forwarding path; and the first device acquires a matched record from a pre-stored transmission layer index, and the stream transmission layer parameter is adjusted according to the content of the matched record, wherein the index of the matched record comprises the IP address of the second device and the identifier of the network device included in the first forwarding path.