Objective To investigate the diagnosis of mesenteric vascular diseases by two-dimensional ultrasonography and color Doppler flow imaging (CDFI) and to summarize ultrasonographic imaging features.Methods Eighteen patients were examined by ultrasonography in emergency.The thickness,scope and echo of the wall of the small intestine,the condition of intestinal peristalsis,the blood flow of the wall of the bowel and the mesentery were measured by ultrasonography.Results The diagnosis of all the cases was confirmed by operation.The accuracy rate of ultrasonographic examination was 83.3% (15/18).Two patients were pseudo-positive( 11.1% ) and one patient was pseudo-negative( 5.6% ).Conclusions The ultrasonographic examination with directimaging features can determine the diagnosis of the disease and assess the classification and scope of mesenteric vascular diseases,hence is the first choice and an indispensable method.