The invention relates to a system for providing stable hot water by coordinating a heat pipe with a medium and high temperature phase change heat storage medium. The system comprises a water supply subsystem used for supplying cold water, a circular heat supply subsystem used for providing the hot water for users, a medium and high temperature phase change heat storage subsystem utilizing sensibleheat and latent heat of the medium and high temperature phase change heat storage medium to achieve heat storage, a heat transfer water storage subsystem with fluid communicating between the water supply subsystem and the circular heat supply subsystem, and a heat pipe heat dissipating subsystem, wherein the heat pipe heat dissipating system comprises a closed heat pipe and the heat pipe phase change medium contained in the heat pipe. The two ends of the heat pipe are arranged in the heat transfer water storage subsystem and the medium and high temperature phase change heat storage subsystem,thus by means of the heat pipe phase change medium, heat is transferred from the medium and high temperature phase change heat storage subsystem to the heat transfer water storage subsystem, and coldwater entering the heat transfer water storage subsystem is heated into the hot water. According to the system, the medium and high temperature phase change heat storage medium is selected, and the heat pipe heat dissipating subsystem is increased so as to ensure timeliness and stability of water supply.