Abstract: Objective:To explore the relationship between ambient cistern and common complications in patients with craniocerebral trauma.Methods:279 cases of decompressive craniectomy in our hospital from November 2013 to November 2016 were selected to explore the relationship between ambient cistern and common complications in patients with craniocerebral trauma.Results:136 cases with narrow ambient cistern，38 cases had no postoperative complications，58 cases had a kind of complications，31 cases had two kinds of complications，9 cases had three kinds of complications.38 cases of gastrorrhagia，24 cases of pulmonary infection，21 cases of hyperglycaemia，16 cases of urinary tract infection，20 cases of diarrhea，14 cases of delayed intracranial hematoma，15 cases of the others.There were 84 cases of unilateral ambient cistern occlusion.There were 30 case of one kind of complications，42 case of two kinds of complications，12 case of three or more kinds of complications，including 49 cases of gastrorrhagia，38 cases of pulmonary infection，25 cases of hyperglycaemia，8 cases of urinary tract infection，13 cases of diarrhea，9 cases of delayed intracranial hematoma and 11 cases of the others.There were 59 cases of both sides of blocked ambient cistern.There were 6 case of one kind of complications，18 case of two kinds of complications，35 case of three or more kinds of complications，including 53 cases of gastrorrhagia，51 cases of pulmonary infection，33 cases of hyperglycaemia，2 cases of urinary tract infection，2 cases of diarrhea，6 cases of delayed intracranial hematoma and 10 cases of the others.Conclusion:The more serious the change of the ambient cistern，the more kinds of postoperative complications.The incidence of gastrorrhagia，pulmonary infection and hyperglycaemia was positively associated with the degree of compression，the incidence of diarrhea was negatively correlated to the degree of compression，delayed intracranial hematoma and urinary tract infection was not associated with the degree of compression.

Key words: craniocerebral injury, ambient cistern, complication