A method for establishing a cascade of multipoint control servers, comprising: predefining and storing conference information in a management platform, wherein said predefined conference information at least includes the conference access numbers for accessing conferences and site numbers included or allowed for the conferences, and wherein a site refers to a participant means; allocating, by the management platform, a first multipoint control server to a first conference according to conference information of the first conference carried in a call from any site, wherein the conference information of the first conference comprises a conference access number of the first conference and a site number comprised in the first conference, and the site number comprised in the first conference comprises a conference access number of a second conference, so that one conference may participate as a site of another conference; receiving, by the management platform, a request for calling the second conference from the first multipoint control server, wherein the request for calling the second conference carries conference information of the second conference; allocating, by the management platform, a second multipoint control server to the second conference according to the conference information of the second conference, wherein the conference information of the second conference comprises the conference access number of the second conference and a site number comprised in the second conference; and sending, by the management platform, an address of the first multipoint control server to the second multipoint control server, so that the second multipoint control server calls the first multipoint control server to establish a cascading channel between the first multipoint control server and the second multipoint control server. predefining and storing conference information in a management platform, wherein said predefined conference information at least includes the conference access numbers for accessing conferences and site numbers included or allowed for the conferences, and wherein a site refers to a participant means; allocating, by the management platform, a first multipoint control server to a first conference according to conference information of the first conference carried in a call from any site, wherein the conference information of the first conference comprises a conference access number of the first conference and a site number comprised in the first conference, and the site number comprised in the first conference comprises a conference access number of a second conference, so that one conference may participate as a site of another conference; receiving, by the management platform, a request for calling the second conference from the first multipoint control server, wherein the request for calling the second conference carries conference information of the second conference; allocating, by the management platform, a second multipoint control server to the second conference according to the conference information of the second conference, wherein the conference information of the second conference comprises the conference access number of the second conference and a site number comprised in the second conference; and sending, by the management platform, an address of the first multipoint control server to the second multipoint control server, so that the second multipoint control server calls the first multipoint control server to establish a cascading channel between the first multipoint control server and the second multipoint control server.