Objective:To evaluate the clinical value of abdominal color Doppler ultrasonography in the differential diagnosis of colonic polyps in children.Methods:From January 2017 to January 2020, 300 children with suspected colonic polyps were studied.All patients were examined by colonoscopy and abdominal color Doppler ultrasound respectively.The results of colonoscopy were taken as the gold standard to evaluate the diagnostic efficacy of abdominal color Doppler ultrasound in the differential diagnosis of colonic polyps in children.The diagnostic accuracy of abdominal color Doppler ultrasound in diagnosis of colonic polyps in children with different location, type and focus size was analyzed.Results:The diagnostic sensitivity and specificity of abdominal color Doppler ultrasound for colonic polyps in children were 87.60%(113/129) and 97.08%(166/171), respectively.The overall diagnostic accuracy was 93.00% (279/300), the positive predictive value was 95.76%(113/118), and the negative predictive value was 91.21% (166/182). The diagnostic accuracy of abdominal color Doppler ultrasound were 85.71%(12/14), 83.33%(10/11), 87.50%(28/32), 86.79%(46/53) and 89.47%(17/19) for children's polyps in ascending colon, transverse colon, descending colon, sigmoid colon and rectum, and were 86.17%(81/94), 92.31%(24/26) and 88.89%(8/9) for juvenile polyps, black spot polyp syndrome and adenomatous polyps, respectively.There were no statistically significant differences between the two groups (χ 2=0.250, 0.721; P=0.993, 0.697). The diagnostic accuracy of abdominal color Doppler ultrasound in children with diameter ≤1 cm (38.09%) was significantly lower than that in children with 1 cm