The disclosure claims an Evolved Universal Mobile Telecommunication System (UMTS) Radio Access Network (E-UTRAN) system and a task tracking method thereof. The method comprises the steps of: creating a message, which carries the parameters of multiple tasks for tracking a same user; sending the message to an Evolved NodeB (eNodeB), which is used for the eNodeB to create multiple tasks to track the user according to the parameters. The disclosure also claims an E-UTRAN system, which comprises: a creation module, configured to create a message which carries the parameters of multiple tasks for tracking a same user; a sending module, configured to send the message to the eNodeB; an eNodeB, configured to establish multiple tasks to track the user according to the parameters. The disclosure can guarantee that multiple tasks track one appointed user synchronously.