The invention discloses a system supporting the multimedia conferencing reservation, comprising: a media resource server, a conference application server. Also disclosed is a method for supporting the multimedia conferencing reservation, comprising: conference application server receiving the conferencing reservation request; conference application server building up meeting plate and requesting to reserving corresponding media resource to the media resource server; transmitting notification to the participating terminal of resource is successfully reserved; arriving at the conferencing reservation time, the conference application server transmitting order for participating into the conference to the conference terminal via IMS; the terminal received the order participating into the conference. The method supports the diversification of participating into conference; realizes that the conference server builds up the multimedia conference actively at the predetermined time and avoids the time waste and bad feeling when the conference inviter invites and builds up the conference bridge one by one.