Objective To evaluate the effects of noninvasive positive pressure ventilation（NIPPV） on acute pulmonary edema by drowning in fresh water.Method 26 patients with acute pulmonary edema by drowning were randomly divided into two groups.13 patients in control group just received conventional treatment and 13 patients in treatment group received NIPPV based on conventional treatments.The symptoms

signs

chest X-ray appearance

arterial blood gas analysis.Results 24 h after noninvasive positive pressure ventilation respiratory rates decreased from（38±8）times/min to（18±4）times/min（p<0.05）

heart rates decreased from（120±20）times/min to（85±20）times/min（p<0.05）.The time of chest X-ray been normol、lung moist rale disappeared and in-patient was markedly shorter

and the differences were statistically significant（p<0.01 or p<0.05）.Conclusion Drug and NIPPV can improve symptoms、hypoxemia of acute pulmonary edema by drowning more rapidly than conventional therapy.NIPPV is the important therapy of drowning patient.