Due to the evolution of telecommunication services, the existing system, which is Trouble Reporting Information System -II (TRIS-II), has unsatisfied the demand of trouble repairing operation. For this reason, TL was designated to develop the electric Trouble Reporting Information System (eTRJS) for CHT. This development will be divided into two phases: the first phase is going to develop for Leased Line Service; and the second phase is going to develop for Local Line Service, Pay Phone Line Service, Asymmetric Digital Subscriber Line (ADSL) Service, Multimedia On Demand(MOD) Service and other new telecommunication services. After the 3rd generation Trouble Reporting Information System has been developed, it will replace the TRIS-II. This article focuses on the Trouble Reporting Information System for Leased Line Service (eTRIS/LLS) and it will make a description in details. The major function of the eTRIS/LLS is to provide leased line service with a control and administration of operation procedures such as complaints, tests and repairs when the services are out of order troubles. The trouble reporting operation starts from the moment of accepting customer's trouble complaint, then the maintenance staffs execute the operation of test and repair sequentially, and end up, with the trouble eliminated and with the customer's confirmation. eTRIS/LLS handles all control and administration of operation flows automatically and immediately, and thus helps to hasten the operation flows, increase the efficiency of trouble repairing and improve the quality of customer service.