A method for implementing storage service continuity in a storage system, wherein the storage system comprises a front-end interface card and a plurality of storage controllers, the front-end interface card communicates with the plurality of storage controllers, and the front-end interface card communicates with a host; and the method comprises: detecting, by the front-end interface card, a status of a first storage controller, wherein the first storage controller is a storage controller that is in the plurality of storage controllers and that is configured to process an access request of the host; and when the first storage controller is in an abnormal state, selecting, by the front-end interface card, a second storage controller from the plurality of storage controllers for the host to process the access request of the host, wherein the second storage controller is a storage controller that is in the plurality of storage controllers and that is different from the first storage controller; the method characterised in that: the front-end interface card is connected to the plurality of storage controllers through a peripheral component interconnect express bus; the selecting, by the front-end interface card, a second storage controller is based on a storage controller switching table that is maintained by the front-end interface card, wherein the storage controller switching table records that the second storage controller is a backup storage controller of the first storage controller; and when the first storage controller is in the abnormal state and the front-end interface card has not completely obtained a result of the access request that is of the host and that is processed by the first storage controller, the method further comprises obtaining, by the front-end interface card from the second storage controller, a processing result of the access request of the host; and, selecting, from the processing result of the access request of the host, the not completely obtained result of the access request that is of the host and that is processed by the first storage controller. detecting, by the front-end interface card, a status of a first storage controller, wherein the first storage controller is a storage controller that is in the plurality of storage controllers and that is configured to process an access request of the host; and when the first storage controller is in an abnormal state, selecting, by the front-end interface card, a second storage controller from the plurality of storage controllers for the host to process the access request of the host, wherein the second storage controller is a storage controller that is in the plurality of storage controllers and that is different from the first storage controller; the method characterised in that: the front-end interface card is connected to the plurality of storage controllers through a peripheral component interconnect express bus; the selecting, by the front-end interface card, a second storage controller is based on a storage controller switching table that is maintained by the front-end interface card, wherein the storage controller switching table records that the second storage controller is a backup storage controller of the first storage controller; and when the first storage controller is in the abnormal state and the front-end interface card has not completely obtained a result of the access request that is of the host and that is processed by the first storage controller, the method further comprises obtaining, by the front-end interface card from the second storage controller, a processing result of the access request of the host; and, selecting, from the processing result of the access request of the host, the not completely obtained result of the access request that is of the host and that is processed by the first storage controller. the front-end interface card is connected to the plurality of storage controllers through a peripheral component interconnect express bus; the selecting, by the front-end interface card, a second storage controller is based on a storage controller switching table that is maintained by the front-end interface card, wherein the storage controller switching table records that the second storage controller is a backup storage controller of the first storage controller; and when the first storage controller is in the abnormal state and the front-end interface card has not completely obtained a result of the access request that is of the host and that is processed by the first storage controller, the method further comprises obtaining, by the front-end interface card from the second storage controller, a processing result of the access request of the host; and, selecting, from the processing result of the access request of the host, the not completely obtained result of the access request that is of the host and that is processed by the first storage controller.