This book states that the proceedings gathers selected papers from 2021 4th International Conference on Civil Engineering and Architecture (ICCEA 2021), which was taken place in Seoul, South Korea, during July 10-12, 2021. The conference is the premier forum for the presentation of new advances and research results in the fields of theoretical, experimental, and practical civil engineering and architecture. And this proceedings from the conference mainly discusses architectural design and project management, environmental protection and spatial planning, design and analysis of building materials, and structural engineering and safety. And these materials can be useful and valuable sources for researchers and professionals working in the field of civil engineering and architecture.