A Packet Data Convergence Protocol, PDCP, duplication function activation method, applied to a User Equipment, UE, and comprising: receiving a PDCP duplication function activation signaling from a network, wherein the PDCP duplication function activation signaling comprises at least one data split indication identifier of at least one radio bearer, and the at least one radio bearer is configured with a PDCP duplication function; and determining a duplication number of a data packet of the at least one radio bearer based on the PDCP duplication function activation signaling, characterized in that determining the duplication number of the data packet of the at least one radio bearer based on the PDCP duplication function activation signaling comprises: when the at least one data split indication identifier indicates that the at least one radio bearer is allowed to perform data split, determining whether a data amount of the data packet is greater than or equal to a preset split threshold; if the data amount of the data packet is greater than or equal to the preset split threshold, dividing the data packet into a first data packet and a second data packet, and determining a number of first logical channels used by the at least one radio bearer and a number of second logical channels used by the at least one radio bearer based on indication information included in the PDCP duplication function activation signaling, to obtain a duplication number of the first data packet and a duplication number of the second data packet; and if the data amount of the data packet is less than the preset split threshold, determining a number of third logical channels used by the at least one radio bearer based on the indication information, to obtain the duplication number of the data packet, wherein the first data packet refers to a data packet transmitted through a master node, the second data packet refers to a data packet transmitted through a secondary node, the first logical channels belong to the master node, the second logical channels belong to the secondary node, and the third logical channels belong to the master node. receiving a PDCP duplication function activation signaling from a network, wherein the PDCP duplication function activation signaling comprises at least one data split indication identifier of at least one radio bearer, and the at least one radio bearer is configured with a PDCP duplication function; and determining a duplication number of a data packet of the at least one radio bearer based on the PDCP duplication function activation signaling, when the at least one data split indication identifier indicates that the at least one radio bearer is allowed to perform data split, determining whether a data amount of the data packet is greater than or equal to a preset split threshold; if the data amount of the data packet is greater than or equal to the preset split threshold, dividing the data packet into a first data packet and a second data packet, and determining a number of first logical channels used by the at least one radio bearer and a number of second logical channels used by the at least one radio bearer based on indication information included in the PDCP duplication function activation signaling, to obtain a duplication number of the first data packet and a duplication number of the second data packet; and if the data amount of the data packet is less than the preset split threshold, determining a number of third logical channels used by the at least one radio bearer based on the indication information, to obtain the duplication number of the data packet, wherein the first data packet refers to a data packet transmitted through a master node, the second data packet refers to a data packet transmitted through a secondary node, the first logical channels belong to the master node, the second logical channels belong to the secondary node, and the third logical channels belong to the master node.