Abstract: According to the fluctuation of outdoor environmental parameters and the temperature fluctuation characteristics of heat storage system,a variable flow operation control strategy of solar collector system is proposed.An optimal flow optimization model was established,and the optimal flow value polynomial function under different operating conditions was regressed.The system operation performance under the constant flow operation strategy was compared and analyzed.The results show that compared with the constant flow operation mode,the net income of the solar collector system is significantly improved when using the variable flow control strategy.For the 100 m~2 series parallel flat plate solar collector system in Lhasa,when the variable flow operation strategy is adopted,although the pump consumption increases,the heat collection gain is greater.Compared with the unit heat collection area flow rate of 0.02 m~3/（h·m~2）,the net income of the collector system increases by 468.7 MJ and 6.75%.