Abstract: Objective:To investigate the clinical value of ultrasound measuring the extension diameter and thickness of occluder in interventional treatment of congenital heart disease(CHD).Methods:The clinical data of 90 patients treated with occluder were retrospectively analyzed.The patients were divided into the standard group(67 cases treated with occluder model followed by the consensus of experts) and non-standard group(23 cases treated with occluder model no followed by the consensus of experts) according to "common congenital heart disease interventional Chinese experts consensus".The operation time,ultrasonic examination time,hemodynamics,ultrasound measuring the extension diameter and thickness of occluder,and position of the occluder between two groups were compared.Results:There were no statistical significances in the ultrasonography time,pulmonary blood volume/systemic blood volume and pulmonary artery mean pressure between two groups(P>0.05),and the operation time in standard group was lower than that in non-standard group(P<0.05).After 2 days and 3 months of operation,the extension diameter and maximum defect diameter of occluder in standard group and after 3 months of operation in non-standard group significantly decreased(P<0.01).After 2 days and 3 months of operation,the extension diameter and maximum defect diameter of occluder in standard group were less than those in non-standard group(P<0.05 to P<0.01).The thickness of the atrial septal defect occluder type 16 to 30 mm in CHD disease was more than that in occluder type ≤ 15 mm(P<0.05).After 3 months of placing occluder,the rates of left atrium shift and total position change of occluder in non-standard group were higher than those in standard group(P<0.05 and P<0.01).Conclusions:Ultrasound can accurately and easily measure the extension diameter and thickness of occluder,effectively monitor the occluder deformation process,and assess the clinical efficacy of occluder and postoperative status.