The 5th Int’l Conference on Surface and Interface of Materials (SIM 2019) will be held Sanya, China during January 3-5, 2019. SIM is an annual regular conference since 2015 and has been successfully held in Shanghai, China and Bangkok, Thailand. SIM 2019 will be a valuable and important platform for inspiring Int’l and interdisciplinary exchange at the forefront of Surface and Interface of Materials.