The invention relates to a method for improving reading efficiency of redundant array of inexpensive disks 1, which comprises the following steps of: providing the block where the magnetic head of each disk in the redundant array of inexpensive disks 1 is; receiving a reading command and obtaining the read block to be read by the reading command; picking a first prior disk from the disks, whereinthe block on which the magnetic head of the first prior disk is arranged is closest to the read block; and transmitting the reading command to the first prior disk.