2021 International Conference on Computer Technology and GIS (CTGIS) will be held on May. 28-30, 2021 in Guangzhou, China. CTGIS 2021 is to bring together innovative academics and industrial experts in the field of computer technology and GIS(Geographic Information System) to a common forum. The primary goal of the conference is to promote research and developmental activities in advanced algorithms and control engineering. And another goal is to promote scientific information interchange between researchers, developers, engineers, students, and practitioners working all around the world.The conference will be held every year to make it an ideal platform for people to share views and experiences in omputer technology and GIS and related areas.