唐代军镇关津的涉外事务管理职能

唐代边疆军区“道”之下设置之军、镇、守捉、城等军事与边防单位，以及边防要害及交通要冲之处设置的关、津，均这外交使节或各类蕃客所首先接触或必经之处，故都在不同程度上担负着涉外事务之管理职责，构成为唐代庞大周密的外交管理体系中不可或缺的一环。从而保证了唐代外交活动的正常开展和运行．

Jun, Zhen, Barrier and ferrys Administrative Function on Concerning Foreign Affairs in Tang Dynasty

Jun, Zhen, Shouzhuo and Cheng, as military and frontier authorities under the jurisdiction of the border area military command Dao in Tang dynasty, with barrier and ferry set up in strategic points in border area and vital communication lines, are all the first authorities that diplomatic envoys and foreign visitors come into contact with or the only roads they have to follow. So these authorities also have administrative function on conceming foreign affairs to some extent, and they play an important role in the huge and thoroughly administrative system of diplomacy in Tang dynasty.