Chen Shangyi（陈尚义）pirates group rose from Guangdong Province in 1684，the times of Four Port Trade System，and then expanded to the whole eastern coast with frequent activities covering Liaodong and Shandong，near Korea. The Joseon government had already got substantial information on pirates'rampancy on Chinese eastern coast before overhearing Chen Shangyi pirates group through Joseon Emissaries'information collection. After that the government kept an eye on this pirate group and got the news of their rebellion again.

Joseon Emissaries'obtained the information of Chen Shangyi pirates group'activities mainly by inquiring local people as well as buying and copying Qing's official documents，hence Korean historical documents，especially the Records of Trips to Beijing（燕行录）include a lot of information on Chen Shangyi pirates group. Although it is still need to recheck the facticity of Qing's official documents such as Ti Ben（题本）and Tang Bao（塘报），these precious Korean documents that no longer exist in China have unique value. Through analyzing Joseon Emissaries' intelligence gathering of Chen Shangyi pirates group，one can get a full view of Joseon Emissaries' process of intelligence gathering on China，and realize the value of the records relating to China in Korean historical documents.