Abstract: A data swapping method is provided. The data swapping method is applied to a host. An operating system and a target application are installed on the host. The operating system includes user space. A user interface of the target application is disposed in the user space. The user interface corresponds to one storage device. A specific solution includes: The host obtains a swap request of the target application, and calls, based on the swap request, the user interface to perform an operation on the storage device. The swap request is a swap-in request or a swap-out request. The swap-out request is used to request to write data of the target application from a memory of the host to the storage device. The swap-in request is used to request to write data in the storage device to the memory.