In the early years of China's reform and opening, the top leaders of the two countries visited the other country frequently. Their visit to the other side brought a great change to the Yanbian(延邊) Chinese Korean people. In 1978, the Korean people who learned about Hua Guofeng(華國鋒)'s visit to North Korea learned that North Korea-China relations had improved greatly, and they could escape the fear of North Korea. On the other hand, the visit to North Korea by Hua Guofeng and Deng Xiaoping(鄧小平) of 1978 solved one of the problems left by the Korean War. As a result of these visits, North Korea has sent a list of Chinese Korean who were missing in the Korean War to China. The Communist Party of China acknowledged the missing Chinese descendants on the list as heroes of the Chinese Revolution and sent documents to prominent families. In 1982 Deng Xiaoping first visited North Korea to celebrate Kim Il Sung(金日成)'s 70th birthday. In the autumn, Kim Il Sung visited China, and China treated Kim Il Sung well. With the visits of the leaders of the two countries, North Korea took a friendly policy toward the Chinese Koreans. And allowed them to visit North Korea and visit the Yanbian people of North Korea. Since 1983, family reunions between Chinese Korean and North Koreans have begun. Since then, the Chinese Koreans who had gone to and from North Korea began to trade in North Korea.