A system for decreasing returning water temperature of a heat supplying pipeline is characterized by comprising a heat source (1), a heat pump (2) and a heat storing module (3), wherein heat is absorbed at a primary side, and thus the returning water temperature of the primary side is decreased; and then the absorbed heat is transferred to a secondary side and is used for removing the interferencecaused by load fluctuation at the secondary side, and thus a heat supplying system can stably run. According to the system, a heat pump and a heat storing mode are combined, and thus the self-adapting performance of the heat supplying system is improved; the control process is simplified; and an efficient and low-cost-running type heat supplying system is realized.