A memory access method, applied to a cloud control device on the side of a requesting node on a cloud computing network, wherein the method comprises: receiving, by the cloud control device, a request packet that is sent by the requesting node and is for accessing to-be-accessed data stored in a memory resource provided by a contributing node to the requesting node for use, wherein the request packet comprises identification information of the requesting node and a first physical address of the to-be-accessed data, and the first physical address of the to-be-accessed data is a physical address of the to-be-accessed data, on the requesting node (step 204); querying, by the cloud control device, a preset first mapping relationship according to the first physical address of the to-be-accessed data to acquire identification information of the contributing node, wherein the first mapping relationship comprises a mapping relationship between the identification information of the contributing node and a physical address that is of the memory resource provided by the contributing node and is on the requesting node (step 205); and sending, by the cloud control device, an access request message for accessing the to-be-accessed data to a cloud control device on the side of the contributing node according to the identification information of the contributing node, so that the cloud control device on the side of the contributing node queries a second mapping relationship according to the identification information of the requesting node in the access request message to acquire a second physical address of the to-be-accessed data, and transmits the second physical address of the to-be-accessed data and the access request message to the contributing node, so that the contributing node completes an access operation on the to-be-accessed data at the second physical address of the to-be-accessed data according to the access request message, wherein the access request message comprises the identification information of the requesting node, the second mapping relationship comprises a mapping relationship between the identification information of the requesting node and a physical address that is of the memory resource provided by the contributing node and is on the contributing node, and the second physical address of the to-be-accessed data is a physical address of the to-be-accessed data, on the contributing node (step 206). receiving, by the cloud control device, a request packet that is sent by the requesting node and is for accessing to-be-accessed data stored in a memory resource provided by a contributing node to the requesting node for use, wherein the request packet comprises identification information of the requesting node and a first physical address of the to-be-accessed data, and the first physical address of the to-be-accessed data is a physical address of the to-be-accessed data, on the requesting node (step 204); querying, by the cloud control device, a preset first mapping relationship according to the first physical address of the to-be-accessed data to acquire identification information of the contributing node, wherein the first mapping relationship comprises a mapping relationship between the identification information of the contributing node and a physical address that is of the memory resource provided by the contributing node and is on the requesting node (step 205); and sending, by the cloud control device, an access request message for accessing the to-be-accessed data to a cloud control device on the side of the contributing node according to the identification information of the contributing node, so that the cloud control device on the side of the contributing node queries a second mapping relationship according to the identification information of the requesting node in the access request message to acquire a second physical address of the to-be-accessed data, and transmits the second physical address of the to-be-accessed data and the access request message to the contributing node, so that the contributing node completes an access operation on the to-be-accessed data at the second physical address of the to-be-accessed data according to the access request message, wherein the access request message comprises the identification information of the requesting node, the second mapping relationship comprises a mapping relationship between the identification information of the requesting node and a physical address that is of the memory resource provided by the contributing node and is on the contributing node, and the second physical address of the to-be-accessed data is a physical address of the to-be-accessed data, on the contributing node (step 206).