The present invention discloses a method, a system and a C-RNC for determining the support capability of a local cell, the method comprising the following steps of: a controlling radio network controller (C-RNC) receiving from a node B capability support information about the local cell of the node B, wherein the capability support information comprises uplink multi-carrier capability support information and shared interconnection of type B (IUB) transport bearer capability support information; and the C-RNC determining by default that the local cell supports a separate IUB transport bearer, and determining an uplink multi-carrier support capability and a shared IUB transport bearer support capability of the local cell according to the capability support information. The present invention accelerates the processing of the C-RNC, thereby improving the system performance.