Phaeocystis globosa bloom has become one of the hotspots of harmful algae research at home and abroad because of its large scale and serious damage.This paper summarized the serious harm of algal bloom of P.globosa to fishery production,global sulfur cycle and carbon cycle,as well as the safety of nuclear power cold source,analyzed the internal and external causes of algal bloom,and put forward the preventive measures and emergency measures of algal bloom of P.globosa.The purpose of this paper is to provide reference for control of P.globosa.