The present invention discloses a method for supporting extended parameter(s) in a REFER message, applied in a system comprising a parameter proxy server that can receive and forward the REFER message; upon receiving the REFER message including the extended parameter(s), the parameter proxy server performing the following processing: storing said extended parameter(s); sending the REFER message to the indicated party of the message; upon receiving a third party message sent by said indicated party and indicated by the method parameter in the REFER message, adding the extended parameter(s) stored into the third party message; sending the third party message to said third party. With the present invention, those IMS intelligent terminals that do not support the extended parameter(s) in the REFER message can more fully utilize the REFER message to use the abundant services provided by NGN.