Abstract: The present disclosure relates to a method and a device for processing a read command, a controller, and a storage medium, comprising determining at least one read command and a command index number; acquiring a flash memory data unit and data unit information corresponding to each of the read commands, the data unit information comprising a data unit index number and the command index number; searching for a corresponding address entry in an address entry buffer based on the data unit information, the address entry buffer comprising at least one buffer unit storing the address entry with the corresponding data unit information; and in response to finding an address entry corresponding to the data unit information, transmitting the flash memory data unit to a corresponding host memory address in the address entry and storing the flash memory data unit therein.