Photonics Asia 2019 was held at Hangzhou International Expo Center during 20th-23th, October. The conference was hosted by the International Society for Optical Engineering (SPIE) and the Chinese Optical Society (COS), and was undertaken by the College of Optical Science and Engineering, Zhejiang University. Over 800 people attended the conference with 16 topics, including Advanced photonics, quantum and nonlinear optics, advanced optical imaging, laser processing, bio-photonics, plasmonics, holography and so on.