The 2021 2nd International Conference on Agricultural Science and Technology and Food Engineering (ASTFE 2021) was successfully held in Qingdao, China on May 28-30,2021. ASTFE 2021 is to bring together innovative academics and industrial experts in the field of agricultural science and technology and food engineering to a common forum. The primary goal of the conference is to promote research and developmental activities in agricultural science and technology and food engineering and another goal is to promote scientific information interchange between researchers, developers, engineers, students, and practitioners working all around the world.The conference model was divided into two sessions, including oral presentations and keynote speeches. In the first part, some scholars, whose submissions were selected as the excellent papers, were given 15 minutes to perform their oral presentations one by one. Then in the second part, keynote speakers were each allocated 30-45 minutes to hold their speeches.In this conference, we were greatly honored to have three distinguished experts to serve as our Conference Chairman. There were over 60 experts and scholars in the area of agricultural science and technology and food engineering representing different famous universities and institutes around the globe to form our organizing committee and technology program committee. During the conference, we were pleased to invite two distinguished experts to present their insightful speeches. Prof. Wang Fei, from Agriculture Products Processing Research Institute, Chinese Academy of Tropical Agricultural Sciences. His research area: Agricultural products processing; Utilization of natural cellulose in functional materials; Recycle and utilization of carbon dioxide; Surface modification of porous ceramic membrane. Another keynote speaker, A. Prof. Zhu Wenhui, from College of Food Science and Engineering, Bohai University. She has outstanding research in Processing and storage of aquatic products, Flavor chemistry of aquatic products. Their insightful speeches had triggered heated discussion. Every participant praised this conference for disseminating useful and insightful knowledge.The participants of the conference were from most part of the world, with background of either academia or industry, even well-known enterprise. The success and prosperity of the conference is reflected high level of the papers received. The proceedings are a compilation of the accepted papers and represent an interesting outcome of the conference. This book covers 2 chapters: 1. Agricultural science and technology; 2. Food Engineering.We would like to acknowledge all of those who supported ASTFE 2021. Each individual and institutional help were very important for the success of this conference. Especially we would like to thank the organizing committee for their valuable advices in the organization and helpful peer review of the papers. We sincerely hope that ASTFE 2021 will be a forum for excellent discussions that will put forward new ideas and promote collaborative researches. We are sure that the proceedings will serve as an important research source of references and the knowledge, which will lead to not only scientific and engineering progress but also other new products and processes.List of Committee member are available in this pdf.