Trace element selenium plays an important role in maintaining normal pregnancy function.This paper reviews the prevalence of selenium nutritional status in pregnant women in recent years and the influence of different selenium nutritional status during pregnancy on pregnancy outcome,in order to provide help for the study of selenium nutritional status during pregnancy.Most of the existing studies have clarified the nutritional status of selenium at a certain point during pregnancy,but they have not fully reflected the impact of the change of nutritional status of selenium during pregnancy on p...