At a university in a hot summer and warm winter region,there exist some problems in the parallel-connection solar air-source heat-pump hot-water system at 26 student apartments.For example,the hot water supply is not enough during the abrupt changes of outside meteorological parameters,the solar energy efficiency is low,and the power frequency running of the water pump may cause an energy waste.In this paper,the running mode of the system is divided into the water replenishment mode,the heat storage mode and the water supply mode,and according to the characteristics of different modes,a strategy of streamline management and optimal operation is proposed based on the daily water upper limit control,the hourly water lower limit control,the heating capacity forecast of the solar collector system,the heating capacity forecast of the air-source heat-pump and the water supply at different pressure difference hourly.Then,the proposed strategy and the parameters obtained through experiments are applied to the real-time control of the system.The running results show that the proposed strategy can meet the requirements of the hot water supply,and it achieves a power consumption decrease of 17. 49% and a system COP increase of 19. 98% in 2016 in comparison with those in 2015.