铁券是符节的变种,也是封建制度的产物,它是封建帝王颁赐给有功之臣的享有某种特权的凭证。西汉初年刘邦首次以铁券为誓,封赏功臣世袭爵禄;魏晋时期铁券誓词一变而为免除死罪并成为后世铁券的主要内容;铁券在唐朝曾一度泛滥,到明朝进一步形成制度并趋于完备,到清朝则走向消亡。 Iron coupon is a variant of the festival, but also the product of the feudal system, it is awarded by the feudal emperors to the meritorious deeds enjoy some privilege voucher. In the early years of the Western Han Dynasty, Liu Bang vowed to use iron vouchers for the first time, and rewarded the meritorious heirlooms. In the Wei and Jin Dynasties, vouchers of iron vouchers were changed to exempt the death penalty and became the main contents of later iron vouchers. Iron vouchers once flourished in the Tang Dynasty and further formed the system in the Ming Dynasty And tend to be complete, to the Qing Dynasty is to die.