Abstract: Referring to the difficulties of automatic information collection at pig slaughterhouses with production lines and poor environments, the radio frequency identification (RFID) tag for pork carcass was designed and an online reading and writing system for ultrahigh frequency (UHF) RFID tag was developed, which is able to identify RFID carcass tag automatically on the slaughter line, based on the UHF RFID technologies (902 MHz RFID and relevant UHF antenna system) and Microsoft Visual Studio 2005 and Visual Basic 6.0. Through identification and the auto-correlation of pig ear tag and RFID carcass tag in the intranet traceability recording system at the slaughter factory, the study could not only collect, transmit and deal swine slaughter identification in the key traceability links, but also convert from RFID tag to 1-dimensional bar code and print a set of commercial cutting meat tags based on RFID carcass tag in the sale store. The system has been applied for demonstration in Tianjin pork quality traceability system at 99.9% correct rate for reading RFID tag with up to ten thousand pigs and explored a possibility for application of RFID technology in pork quality traceability system on both technology and application links.