The embodiment of the invention discloses a user whole network tracing method, a control network element and a supporting control element. The method comprises the following steps: receiving a notification message of trace start, wherein the notification message includes user identification and trace data; sending an indication message to the support network element according to the user identification and trace data in the notification message, wherein the indication message indicates the supporting network element to establish a trace task for a user corresponding to the user identification; and receiving a response message which is sent by the supporting network element after the trace task is established, wherein the response message carries indication whether the supporting network element establishes the trace task successfully or not.