The GreenSys 2017 (International Symposium on New Technologies for Environment Control, Energy-saving and Crop Production in Greenhouse and Plant Factory) will be held in Beijing, China from 20th to 24th August 2017. It is our pleasure to host this conference and we would like to invite you to join. This event is a great opportunity to bring together researchers, technicians, academics, and other professionals in greenhouse horticulture and plant factory area to share knowledge and ideas, as well as discuss the state of the art and future perspectives for the greenhouse horticulture and plant factory sector. Beijing is the capital of China, it is an ancient city with more than 3000 years history. There are many historical places such as the Forbidden city, Summer Palace, Great wall and Temple of Heaven etc, which attract tourist from all over the world. Beijing is also a modernized city where skyscrapers and shopping malls everywhere. Furthermore, Beijing is characterized by its’ cultural spirits of openness, innovation, inclusiveness, and people are extremely friendly and known by their hospitality.