A multiple heat source solar heat pump water heater system was presented.This system can heat residential water from air heat source and solar radiation by valve switching，based on different weather conditions.A numerical model for 150 L water heating was established.The performance of different operation modes was simulated.The effect of solar radiation and environment temperature（air heat source）on the system performance was analyzed and the all year round operation status was also calculated.The results showed that heat pump with solar collector mode（HP+SC）took a slightly longer heating time than collector with heat pump mode（SC+HP）and had a higher COP.The former had a high monthly total thermal efficiency than the latter.Heat pump COP and total thermal efficiency increased with increasing solar radiation and environment temperature.On sunny days in April to October，solar collector mode（SC）should have top-priority to save electricity.Heat pump mode（HP）should be only utilized in non-solar radiation conditions.