China Food Quality official website introduced that if you entrust others to process products, you should use the manufacturer's identification code registered by the entrusting party and the corresponding commodity bar code. According to the "Quality Inspection Law Letter [2008] No.67", if you entrust others to process products, you should use the manufacturer's identification code registered by the entrusting party and the corresponding commodity bar code, that is, you must use the bar code registered by the entrusting party and not the bar code of the entrusted party.