Abstract: Staygreen syndrome is the phenomenon of flowering but not fruiting in the early stage,pods but not fruiting in the late stage,and the pods without seeds.Soybean staygreen syndrome has become one of the main factors affecting soybean yield in Henan Province in recent years.In order to reduce the occurrence probability of soybean staygreen syndrome,this paper analyzed the causes of soybean staygreen syndrome according to the investigation of staygreen syndrome occurrence in experimental field from 2019 to 2020 in Luohe City,Henan Province.The results showed that the occurrence of soybean staygreen syndrome was not a one-sided cause,but the result of comprehensive influence of climate,insect pest and management measures.The climate provides suitable conditions,the high temperature and Riptortus pedestris in flowering and podding stage will directly harm soybean plants,and the poor management measures will become the accomplice of Riptortus pedestris,resulting in the occurrence of soybean staygreen syndrome in a large area.The harm of soybean staygreen syndrome can be reduced to a certain extent by adjusting the sowing date of soybean,combining with timely pest control and fine management measures.