What is the purpose of checking ID cards at Yunnan border?

Check the identity information of entry-exit and past personnel. Checking identity cards at the border of Yunnan is a way for the border police or entry-exit police to check the identity information of entry-exit and passing personnel according to regulations, which is a normal performance of their duties and should be actively cooperated. Citizenship number is a unique and life-long identity code for every citizen, which is compiled by public security organs according to the national standard of citizenship number.