A method for remotely managing a sensor network topology, comprising: receiving, by a gateway, a device management DM command sent by a device management server, wherein the DM command acts on a preconstructed management object MO node, wherein the MO node comprises: a node that describes a sensor network topology; and a node that discovers the sensor network topology; wherein the node that describes a sensor network topology comprises a second MO node which describes characteristic information of each sensor device and information of a topology connection relationship among sensor devices; and the node that discovers the sensor network topology comprises a fourth MO node which discovers the topology connection relationship among the sensor devices and optionally the information about a service provided by each sensor device; and managing, by the gateway, a sensor network connected to the gateway according to the DM command, wherein the step of managing comprises: discovering the sensor network topology; wherein the step of receiving the DM command sent by the device management server further comprises: receiving a DM discovery command sent by the device management server, wherein the DM discovery command acts on the fourth MO node; the step of managing the sensor network according to the DM command further comprises: discovering the sensor network topology, and mapping and storing the sensor network topology to the second MO node, wherein the discovering the sensor network topology further: searching for information of an identifier and an address of a sensor device, searching for additional information of the sensor device, searching for information of an associated device of the sensor device, and searching for information of a connection status among the sensor a devices. receiving, by a gateway, a device management DM command sent by a device management server, wherein the DM command acts on a preconstructed management object MO node, wherein the MO node comprises: a node that describes a sensor network topology; and a node that discovers the sensor network topology; wherein the node that describes a sensor network topology comprises a second MO node which describes characteristic information of each sensor device and information of a topology connection relationship among sensor devices; and the node that discovers the sensor network topology comprises a fourth MO node which discovers the topology connection relationship among the sensor devices and optionally the information about a service provided by each sensor device; and a node that describes a sensor network topology; and a node that discovers the sensor network topology; wherein the node that describes a sensor network topology comprises a second MO node which describes characteristic information of each sensor device and information of a topology connection relationship among sensor devices; and the node that discovers the sensor network topology comprises a fourth MO node which discovers the topology connection relationship among the sensor devices and optionally the information about a service provided by each sensor device; and managing, by the gateway, a sensor network connected to the gateway according to the DM command, wherein the step of managing comprises: discovering the sensor network topology; wherein the step of receiving the DM command sent by the device management server further comprises: receiving a DM discovery command sent by the device management server, wherein the DM discovery command acts on the fourth MO node; the step of managing the sensor network according to the DM command further comprises: discovering the sensor network topology, and mapping and storing the sensor network topology to the second MO node, wherein the discovering the sensor network topology further: searching for information of an identifier and an address of a sensor device, searching for additional information of the sensor device, searching for information of an associated device of the sensor device, and searching for information of a connection status among the sensor a devices. receiving a DM discovery command sent by the device management server, wherein the DM discovery command acts on the fourth MO node; the step of managing the sensor network according to the DM command further comprises: discovering the sensor network topology, and mapping and storing the sensor network topology to the second MO node, wherein the discovering the sensor network topology further: searching for information of an identifier and an address of a sensor device, searching for additional information of the sensor device, searching for information of an associated device of the sensor device, and searching for information of a connection status among the sensor a devices. searching for information of an identifier and an address of a sensor device, searching for additional information of the sensor device, searching for information of an associated device of the sensor device, and searching for information of a connection status among the sensor a devices.