The utility model discloses a bi -polar power chain looped netowrk relates to electric power system power transmission and distribution technical field for improve the operational reliability of electric wire netting. Bi -polar power chain looped netowrk is including the 500kV transformer substation and the flexible direct current transmission system that regard as the power end respectively to itlies in to reach at least two 500kV transformer substation with 220kV load line way between the flexible direct current transmission system, wherein, every 220kV load line way is including at least one 220kV transformer substation, and the one end on every 220kV load line way is connected with 500kV transformer substation, the other end and flexible direct current transmission headtotail. The utility model provides a bi -polar power chain looped netowrk is used for receiving end load center's 220kV electric wire netting.