Disclosed in embodiments of the present invention are a data processing method and a related product. The method comprises: determining PDCP data packets to be renumbered when it is necessary to switch to a target base station having different numbering manners of packet data convergence protocol (PDCP) digit number COUNTs; renumbering the PDCP data packets to be renumbered, so that the renumbered PDCP COUNTs fall within a range supported by the target base station; and sequentially transmitting the renumbered PDCP data packets according to the renumbered COUNTs. The embodiments of the present invention help to reduce the packet loss rate when the terminal is switched between systems having different numbering manners of PDCP serial numbers, thereby improving user experience.