Abstract: Objective  To explore the causes and countermeasures of chylous fistula after neck lymphatic malformation occurred in children patients.
Methods  In this case,at first we  use of local compression and continuous negative pressure drainage treatment,supplemented by fasting,parenteral nutrition and somatostatin and other symptomatic support therapy.
Results  Conservative treatment fails and then be cured by surgery.
Conclusion  Children’s neck lymphatic malformation postoperative chylous fistula and chylothorax most can be cured by conservative treatment.daily lead traffic is larger,more than 7 days after conservative treatment should be should taken operation ligation of thoracic duct treatment actively.

Key words: chylous fistula, thoracic duct