A data transmission method used in a virtual switch technology, wherein the method comprises: a step of receiving an IO request sent by a virtual machine VM, and a step of determining whether the IO request needs to be sent to a physical NIC by using a user mode Open vSwitch OVS, wherein the user mode OVS implements network interworking between virtual machines on a same host or virtual machines on different hosts; a step of determining whether the IO request needs to be sent to a physical NIC by using a user mode OVS and, if it is determined that the IO request needs to be sent to the physical NIC by using the user mode OVS, a step of converting the IO request into an Internet Small Computer Systems Interface iSCSI command in a user mode, and then a step of sending the iSCSI command to the user mode OVS, so as to send the iSCSI command to the physical NIC by using the user mode OVS, wherein the step of determining whether the IO request needs to be sent to a physical NIC by using a user mode OVS comprises: determining disk information of a disk to be accessed by the IO request or a disk in which a file to be accessed by the IO request is located, determining, according to the disk information, whether the disk to be accessed by the IO request is a disk of a remote terminal, if it is determined, according to the disk information, that the IO request is to access a local device disk, the IO request is directly forwarded to the physical NIC by using a kernel mode, and if the disk to be accessed by the IO request is the disk of the remote terminal, determining that the IO request needs to be sent to the physical NIC by using the user mode OVS, wherein the method is performed by: a hypervisor of an electronic device. a step of receiving an IO request sent by a virtual machine VM, and a step of determining whether the IO request needs to be sent to a physical NIC by using a user mode Open vSwitch OVS, wherein the user mode OVS implements network interworking between virtual machines on a same host or virtual machines on different hosts; a step of determining whether the IO request needs to be sent to a physical NIC by using a user mode OVS and, if it is determined that the IO request needs to be sent to the physical NIC by using the user mode OVS, a step of converting the IO request into an Internet Small Computer Systems Interface iSCSI command in a user mode, and then a step of sending the iSCSI command to the user mode OVS, so as to send the iSCSI command to the physical NIC by using the user mode OVS, wherein the step of determining whether the IO request needs to be sent to a physical NIC by using a user mode OVS comprises: determining disk information of a disk to be accessed by the IO request or a disk in which a file to be accessed by the IO request is located, determining, according to the disk information, whether the disk to be accessed by the IO request is a disk of a remote terminal, if it is determined, according to the disk information, that the IO request is to access a local device disk, the IO request is directly forwarded to the physical NIC by using a kernel mode, and if the disk to be accessed by the IO request is the disk of the remote terminal, determining that the IO request needs to be sent to the physical NIC by using the user mode OVS, wherein the method is performed by: a hypervisor of an electronic device. determining disk information of a disk to be accessed by the IO request or a disk in which a file to be accessed by the IO request is located, determining, according to the disk information, whether the disk to be accessed by the IO request is a disk of a remote terminal, if it is determined, according to the disk information, that the IO request is to access a local device disk, the IO request is directly forwarded to the physical NIC by using a kernel mode, and if the disk to be accessed by the IO request is the disk of the remote terminal, determining that the IO request needs to be sent to the physical NIC by using the user mode OVS, wherein the method is performed by: a hypervisor of an electronic device.