A method for obtaining an uplink-downlink carrier frequency spacing, wherein the method is applied to an Narrowband Internet of Things, NB-IoT, system, and comprises: initiating, by UE, a request in a first cell to access the NB-IoT, and receiving an indication message sent by a base station, wherein the indication message is used to indicate the uplink-downlink carrier frequency spacing corresponding to the first cell; and determining, by the UE according to the indication information, the uplink-downlink carrier frequency spacing corresponding to the first cell characterized in that the determining, by the UE according to the indication information, the uplink-downlink carrier frequency spacing corresponding to the first cell comprises: determining, by the UE, that the indication information carries index numbers of uplink and downlink physical resource blocks corresponding to the first cell, and determining, by the UE, a corresponding index number of an LTE uplink physical resource block according to the index number of the downlink physical resource block corresponding to the first cell; and determining, according to the index number of the LTE uplink physical resource block and the index number of the uplink physical resource block corresponding to the first cell, a first carrier frequency deviation corresponding to the first cell and an uplink-downlink basic carrier frequency spacing corresponding to a frequency band used by the first cell, and calculating a sum of the first carrier frequency deviation and the basic carrier frequency spacing to obtain the uplink-downlink carrier frequency spacing of the first cell. initiating, by UE, a request in a first cell to access the NB-IoT, and receiving an indication message sent by a base station, wherein the indication message is used to indicate the uplink-downlink carrier frequency spacing corresponding to the first cell; and determining, by the UE according to the indication information, the uplink-downlink carrier frequency spacing corresponding to the first cell characterized in that the determining, by the UE according to the indication information, the uplink-downlink carrier frequency spacing corresponding to the first cell comprises: determining, by the UE, that the indication information carries index numbers of uplink and downlink physical resource blocks corresponding to the first cell, and determining, by the UE, a corresponding index number of an LTE uplink physical resource block according to the index number of the downlink physical resource block corresponding to the first cell; and determining, according to the index number of the LTE uplink physical resource block and the index number of the uplink physical resource block corresponding to the first cell, a first carrier frequency deviation corresponding to the first cell and an uplink-downlink basic carrier frequency spacing corresponding to a frequency band used by the first cell, and calculating a sum of the first carrier frequency deviation and the basic carrier frequency spacing to obtain the uplink-downlink carrier frequency spacing of the first cell. determining, by the UE, that the indication information carries index numbers of uplink and downlink physical resource blocks corresponding to the first cell, and determining, by the UE, a corresponding index number of an LTE uplink physical resource block according to the index number of the downlink physical resource block corresponding to the first cell; and determining, according to the index number of the LTE uplink physical resource block and the index number of the uplink physical resource block corresponding to the first cell, a first carrier frequency deviation corresponding to the first cell and an uplink-downlink basic carrier frequency spacing corresponding to a frequency band used by the first cell, and calculating a sum of the first carrier frequency deviation and the basic carrier frequency spacing to obtain the uplink-downlink carrier frequency spacing of the first cell.