Abstract： Objective To observe the changes and control effect on blood glucose of gestational diabetes mellitus before and after implementing nutrition intervention.Methods A total of 56 patients with gestational diabetes mellitus were treated with nutrition intervention.Nutrition cognition level and blood glucose control state of those GDM patients before and after implementing nutrition intervention were investigated by self- designed questionnaires.Results After implementing nutrition intervention,the nutrition cognition level of those GDM patients had been significantly improved (P ＜ 0.001 ) and blood glucose level reduced ( P ＜ 0.001 ).No diabetes complication happened.Conclusions Nutrition Intervention can improve the nutrition cognition level of GDM patients,control blood glucose,reduce the possibility of complication even prevent from happening,and promote the pregnancy outcome of GDM patients.