The invention discloses a synchronization method of the information of double controllers in a disk array and a disk array system, wherein the method comprises the following steps of: transmitting respective information to a system cache region by a first controller and a second controller; and comparing the information from the first controller with the information from the second controller by the system cache region and carrying out the information synchronization of the first controller and the second controller. The system cache region is arranged on a back panel of the double controllers, and the information comparison and the updating of the double controllers are realized through the system cache region, thereby solving the problems of high CPU (central processing unit) occupancy rate and poor system property caused by complicated message interaction processes of inquiring, replying, and the like required by the synchronization of two controllers in a double-controller structure in a correlation technique. The invention only needs to directly upload the information and carry out the information updating of the controllers if necessary, can save system resources, reduces the CPU occupancy rate of the controllers and improves the property of the whole system.