Sequence flow detection method and storage device

The invention relates to a sequence flow detection method and a storage device. In the embodiment of the invention, the sequence flow to which the IO command belongs is determined through the address accessed by the IO command; based on the address accessed by the IO command and the access address of the previous command relative to the IO command in the sequence flow to which the IO command belongs, determining whether the IO command disorganizes the sequence of the sequence flow, and determining the address offset between the address accessed by the IO command and the access address of the previous command; therefore, when the IO command disrupts the sequence of the sequence flow and the address offset is smaller than or equal to the preset address offset threshold value of the out-of-order scene, it is determined that the IO command hits the sequence flow, and the sequence flow is still pre-read subsequently. According to the method, the sequence of the sequence flow is not disturbed by the IO command, pre