Artificial floating island is wetland on water and artificial floating island technology is an effective way for the treatment of water eutrophication.This paper briefly discusses the status quo,principle and design of atrificial floating island,and propose the problems in artificial floating island such as low cleaning efficiency,unstandard flooting island technology,no related ctiteria for choosing floating island plants and carriers and weak antiwind and anti-wave capacity,which head-off the populatization of the technology and which are the key problems needing to be focused on and solved.