At the invitation of Professor Jin Longyi, Professor Leyong Wang visited Yanbian University from November 24 to 26, 2017 for academic exchanges. Let's visit Piam Mountain and a Song Pavilion together and listen to the sound of Maoer Mountain's pine waves. I met Professor Yin Bingzhu and colleagues from Yanbian University at Yanbian University. Thank you very much for your warm reception, Professor Longyi Jin.