Abstract: With the large-scale promotion and application of high-speed power line carrier communication（HPLC）,the workload of on-site operation and maintenance increases sharply.Different manufacturers adopt their own terminal equipment operation and maintenance, which leads to low resource utilization rate and high operation and maintenance cost, moreover, the mixed installation of HPLC communication units by multiple manufacturers in the same station area further increases the difficulty of field operation and maintenance.Aiming at the limitations of the terminal equipment of field operation and maintenance, an intelligent terminal based on HPLC technology is designed and developed, which is suitable for the communication between the HPLC communication unit of single and three-phase watt-hour meter and concentrator.According to the latest specifications, the general protocol of data link layer is designed, which fundamentally solves the operation and maintenance problem that terminal equipment from different manufacturers cannot copy each other, and realizes the function unification of terminal operation and maintenance equipment.Through the test, it is shown that the intelligent terminal has the functions of power line carrier meter reading, infrared meter reading, two-dimensional code scanning, field condition evaluation and so on, which can meet the various work needs of field operation and maintenance personnel.