A high-quality heralded single-photon source (HSPS) at 1.5 μm is experimentally demonstrated based on spontaneous four wave-mixing in a piece of dispersion-shifted fiber cooled by liquid nitrogen.To improve the up-limit of the preparation efficiency of the HSPS,commercial dense wavelength-division multiplexing components are used to reduce the loss of the filtering and splitting system between the fiber and the single-photon detectors.As a result,a preparation efficiency of 80％ is realized under a g(2)(0) of 0.06 in our HSPS experimental system,which is the best performance for the fiber-based HSPS at 1.5 μm reported so far.