On behalf of the Organizing Committee, we are delighted to invite you to attend the Fourth International Symposium on Phytochemicals in Medicine and Food (4-ISPMF) to be held in Xi’an, China on June 25-30, 2020. 4-ISPMF is organized by the International Association of Dietetic Nutrition and Safety (IADNS), the Phytochemical Society of Europe (PSE), and the Phytochemical Society of Asia (PSA). We very much look forward to welcoming you at Northwest University which resides in Xi’an. Xi'an is the capital of Shaanxi Province, China and it is one of the oldest cities in China. It has held the position under several of the most important dynasties in Chinese history, including Western Zhou, Qin, Western Han, Sui, and Tang. Xi'an is the starting point of the Silk Road and home to the Terracotta Army of Emperor Qin Shi Huang. The Symposium aims to explore the recent advances in the area of phytochemicals in medicine and food. We hope to bring together scientists of all ages to provide an excellent platform for exchanging ideas, discussing challenges, sharing success stories and setting up new research collaborations. Your active participation will certainly make 4-ISPMF symposium a great success. Welcome to beautiful Xi'an!