In actual operation the centralized solar hot water system whether can more energy saving, influenced by the collector area design, system operation and control mode , installation accuracy and various factors so on. The analysis in this paper is mainly based on the measured data of the collector area key design parameters such as average daily water use, water temperature, the thermal collection efficiency, water tank and pipeline heat loss and other parameters, as well as the problem found in the test of the construction and operation control , put forward reasonable suggestions for energy saving potential, provide reference for the centralized solar hot water system design and operation in future.