The invention, which is suitable for the field of memories, provides a method for detecting the capacity of memories, a method thereof, and a storage controller. The method comprises the following steps: the capacity of the storage controller is configured; different data are written in various pre-selected objective addresses, N objective addresses among the objective addresses correspond to thesame actual address of the memories, and the numbers of N are also different in the memories with different capacities; the data is read from the different objective addresses; and the capacities of the memories to be detected are detected based on whether the data read from the different objective addresses is equal to those written in multiple different objective addresses or not. The embodiment of the invention only needs to determine whether the written different objective addresses are equal to the data which is red from the different objective addresses or not, the capacities of the memories to be detected can be detected, thereby improving the detection speed and the detecting efficiency of the capacities of the memories; meanwhile, the method utilizes the internal row and column structures of the memories with different capacities to perform the detection of the capacities, thereby facilitating the implantation. The invention is suitable for various different application situations.