Phase change material（PCM）can store large energy，and has the properties of big density，small volume and large latent heat of fusion .The experimental investigation on the transient thermal behavior of cascade air source heat pump water heater with PCM has been presented.According to operating heat pump process and the water supply process，the experiment aims to find out how the cascade heat pump work which combined with the PCM.The experimental results showed that in the operating process，the capacity power increased gradually，while the transient coefficient of performance decreased by 13.8% .Furthermore，the temperature curve slope of each point in the water tank was different in the running process，which indicated that the stratification of the water tank existed obviously.In the water supply process，the turnover temperature of the PCM appeared two minutes later than the water temperature on the height，which indicates that the PCM has the features of time delay.The experimental error was between 1.6%热泵热水器

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