A method for determining type of transmission link, characterized by comprising: reporting, by a Device to Device, D2D, receiving UE, a first resource occupancy request over a Network to Device, N2D, link to a network-side device so that the network-side device determines whether a type of a transmission link of the D2D receiving UE in a subframe n is a D2D link or N2D link upon reception of the first resource occupancy request; and determining, by the D2D receiving UE, whether the type of the transmission link in the subframe n is a D2D link or N2D link according to the type of the subframe n or according to the received link type indication information from the network-side device; wherein the subframe n is a D2D subframe; wherein the determining, by the D2D receiving UE, whether the type of the transmission link in the subframe n is a D2D link or N2D link according to the type of the subframe n, comprises: determining, by the D2D receiving UE, whether the type of the transmission link in the subframe n is a D2D link or the N2D link, according to a preconfigured rule; and wherein the type of the subframe n is a subframe in which ACK/ NACK feedback information corresponding to a Physical Downlink Shared Channel, PDSCH, transmission in the N2D link needs to be transmitted; or wherein the determining, by the D2D receiving UE, whether the type of the transmission link in the subframe n is a D2D link or N2D link according to received link type indication information from the network-side device, comprises: determining, by the D2D receiving UE, that the type of a transmission link in a subframe n is a N2D link upon reception of the link type indication information from the network-side device in a subframe (n-k); and wherein the link type indication information is an indication information to schedule a Physical Uplink Shared Channel, PUSCH, transmission of the N2D link in the subframe n. reporting, by a Device to Device, D2D, receiving UE, a first resource occupancy request over a Network to Device, N2D, link to a network-side device so that the network-side device determines whether a type of a transmission link of the D2D receiving UE in a subframe n is a D2D link or N2D link upon reception of the first resource occupancy request; and determining, by the D2D receiving UE, whether the type of the transmission link in the subframe n is a D2D link or N2D link according to the type of the subframe n or according to the received link type indication information from the network-side device; wherein the subframe n is a D2D subframe; wherein the determining, by the D2D receiving UE, whether the type of the transmission link in the subframe n is a D2D link or N2D link according to the type of the subframe n, comprises: determining, by the D2D receiving UE, whether the type of the transmission link in the subframe n is a D2D link or the N2D link, according to a preconfigured rule; and wherein the type of the subframe n is a subframe in which ACK/ NACK feedback information corresponding to a Physical Downlink Shared Channel, PDSCH, transmission in the N2D link needs to be transmitted; or wherein the determining, by the D2D receiving UE, whether the type of the transmission link in the subframe n is a D2D link or N2D link according to received link type indication information from the network-side device, comprises: determining, by the D2D receiving UE, that the type of a transmission link in a subframe n is a N2D link upon reception of the link type indication information from the network-side device in a subframe (n-k); and wherein the link type indication information is an indication information to schedule a Physical Uplink Shared Channel, PUSCH, transmission of the N2D link in the subframe n. determining, by the D2D receiving UE, whether the type of the transmission link in the subframe n is a D2D link or the N2D link, according to a preconfigured rule; and wherein the type of the subframe n is a subframe in which ACK/ NACK feedback information corresponding to a Physical Downlink Shared Channel, PDSCH, transmission in the N2D link needs to be transmitted; or wherein the determining, by the D2D receiving UE, whether the type of the transmission link in the subframe n is a D2D link or N2D link according to received link type indication information from the network-side device, comprises: determining, by the D2D receiving UE, that the type of a transmission link in a subframe n is a N2D link upon reception of the link type indication information from the network-side device in a subframe (n-k); and wherein the link type indication information is an indication information to schedule a Physical Uplink Shared Channel, PUSCH, transmission of the N2D link in the subframe n. determining, by the D2D receiving UE, that the type of a transmission link in a subframe n is a N2D link upon reception of the link type indication information from the network-side device in a subframe (n-k); and wherein the link type indication information is an indication information to schedule a Physical Uplink Shared Channel, PUSCH, transmission of the N2D link in the subframe n.