The invention relates to a recognized method for random accessing of time synchronous code multi-address system. In the invention, when the network distributes the random accessing channel source, itdistinguishes the random access of different business by the sub-channel of ascending pilot channel, and the ascending channel of the random access of different service is different. The node B in thenetwork detects synchronous code, it sends the confirmation messages via the fast physical access channel, and records the number of physical access channel, the number of sub-frame of system, and the number of ascending sub-channel. When terminal accesses via the random access channel, the node B finds the synchronous record, and it can know the accessing type from the information of sub-channelthat is convenient to do different process. The invention avoids the upgrade of soft/hardware, saves the system source, and achieves great backward compatibility at the same time.