The embodiment of the invention discloses a realization method and device of a storage QoS (Quality of Service) control strategy, relates to the technical field of storage and can solve the problems that the processing efficiency of a storage system is lowered since the QoS control strategy in the prior art is issued by taking single I/O (Input/Output) of each volume as granular ranking. The method comprises the following steps: determining an amount of I/O processed within unit time; when the I/O which needs to be issued by each volume, determining a weight ratio of the volume to which the I/O which needs to be issued at present; according to the weight ratio and the amount of the I/O processed within the unit time, determining an amount value of the I/O which is continuously arranged and belongs to the same volume in an I/O issuing sequence; and determining the I/O issuing sequence to conveniently issue the I/O which needs to be issued at present according to the order of the I/O issuing sequence, wherein the number of the I/O which is continuously arranged and belongs to the same volume in the I/O issuing sequence is equal to the amount value.