The National Congress of Mechanical Biosystems Engineering and Mechanization of Iran is the largest gathering of experts in the fields of biosystems mechanical engineering and agricultural mechanization in the country. The National Congress of Mechanical Biosystems Engineering (Agricultural Machinery) and Mechanization of Iran has been the exchange of the latest scientific and research findings in this field, the exchange of scientific and applied experiences of professors, researchers and students. Therefore, the Congress is a great opportunity for reuniting among professors, researchers, experts, specialists, policy makers of the executive units of the country and those interested in the mentioned fields and to study the scientific and executive challenges in its use process. 2021 Biosystems Mechanics Congress, considering the fundamental changes that have taken place in agriculture, is trying to create a suitable platform for benefiting from all the existing potentials to achieve the highest productivity in the country's agriculture. Topics such as smart farming, precision farming, big data analysis, Zero Energy Systems, Auto drivers, Internet of Things (IoT), smart irrigation will bring about fundamental changes in traditional agriculture based on machine and manual labor. Certainly, exploring these research areas will increase the maximum productivity in agriculture in all fields of planting, holding, harvesting and subsequent technologies. The opportunity to hold the 13th National Congress of Mechanical Engineering, Biosystems and Mechanization of Iran at Tarbiat Modares University is a great opportunity for all the loved ones who work in this field to expose the results of their efforts to watching the minds seeking knowledge and learning. Tarbiat Modares University Biosystems Engineering Department, as the organizer of this congress, will make every effort to convey the voice of this technical and engineering field to the country's officials and decision makers so that we can witness the positive effects of this national congress on the country's macro policies.