A method for sending a synchronization signal, comprising: determining, by a base station, according to a synchronization level of the base station, a resource for sending a network listening reference signal, NLRS, wherein the synchronization level is a level in multi-hop synchronisation, and wherein the NLRS is used for clock synchronization between base stations; and sending, by the base station, the NLRS on the determined resource; wherein the determining, by the base station, according to the synchronization level of the base station, the resource for sending the network listening reference signal NLRS specifically comprises: determining, by the base station according to the synchronization level of the base station and a mapping relationship between the synchronization level and a resource for sending an NLRS, the resource for sending the NLRS; wherein, the mapping relationship between the synchronization level and a resource for sending an NLRS specifically comprises that: time domain resources in resources for sending an NLRS by different base stations having different synchronization levels are different; or, frequency domain resources in resources for sending an NLRS by different base stations having different synchronization levels are different; or, the time domain resource and/or frequency domain resource determined by the base station is unusable by another base station having a different synchronization level. determining, by a base station, according to a synchronization level of the base station, a resource for sending a network listening reference signal, NLRS, wherein the synchronization level is a level in multi-hop synchronisation, and wherein the NLRS is used for clock synchronization between base stations; and sending, by the base station, the NLRS on the determined resource; wherein the determining, by the base station, according to the synchronization level of the base station, the resource for sending the network listening reference signal NLRS specifically comprises: determining, by the base station according to the synchronization level of the base station and a mapping relationship between the synchronization level and a resource for sending an NLRS, the resource for sending the NLRS; wherein, the mapping relationship between the synchronization level and a resource for sending an NLRS specifically comprises that: time domain resources in resources for sending an NLRS by different base stations having different synchronization levels are different; or, frequency domain resources in resources for sending an NLRS by different base stations having different synchronization levels are different; or, the time domain resource and/or frequency domain resource determined by the base station is unusable by another base station having a different synchronization level. determining, by the base station according to the synchronization level of the base station and a mapping relationship between the synchronization level and a resource for sending an NLRS, the resource for sending the NLRS; wherein, the mapping relationship between the synchronization level and a resource for sending an NLRS specifically comprises that: time domain resources in resources for sending an NLRS by different base stations having different synchronization levels are different; or, frequency domain resources in resources for sending an NLRS by different base stations having different synchronization levels are different; or, the time domain resource and/or frequency domain resource determined by the base station is unusable by another base station having a different synchronization level. time domain resources in resources for sending an NLRS by different base stations having different synchronization levels are different; or, frequency domain resources in resources for sending an NLRS by different base stations having different synchronization levels are different; or, the time domain resource and/or frequency domain resource determined by the base station is unusable by another base station having a different synchronization level.