The Tang government is a bit like a brave man. It prohibits citizens from going out, but especially welcomes outsiders to come to North Korea. The imperial edict issued in 695 by Wu Shengyuan said: "When foreign countries enter North Korea, their food and materials will be given at different levels." That is, according to the grade, the expenses of all diplomatic envoys in the Tang Dynasty were provided. The procedures for businessmen to do business in China are also extremely simple. According to the laws of the Tang Dynasty, foreign businessmen can "trade for themselves" after obtaining the entry permit and "passing through places". China businessmen mainly deal in jewelry, spices, clothing and catering. At that time, there were many Hu shops in Chang 'an and Luoyang, dealing in Hu cakes, biscuits, pilaf, pancakes and other Hu foods.

1. The Tang Dynasty specially designated residential areas for foreigners.

Foreigners can get married, but they are not allowed to bring them back to China.

Foreigners commit crimes according to the laws of the Tang Dynasty.

Many people came to China in the prosperous Tang Dynasty.