The purpose of this clinical trial is to verify the safety and effectiveness of the Fully Absorbable VSD Occlusion System and VSD Occlusion System produced by Shanghai shape memory alloy materials co., LTD. Clinical trials are designed as prospective, multicenter, randomized controlled, noninferiority clinical trials. Prospective randomized multicenter trial involving about 108 subjects will be enrolled in 4 centers. Patients will be randomized to two groups in equal proportion (54 in each). The success rate of occlusion at 6 months after operation is the main evaluation index in this clinical trial.

1. This is a prospective, multicenter, randomized and noninferiority clinical trial, which is designed to compare the effectiveness and safety with the fully absorbable ventricular septal defect (VSD) occlusion system and VSD occlusion system produced by Shanghai shape memory alloy materials co., LTD.
2. This trial will recruit about 108 subjects from 4 centers. Patients will be randomized to two groups in equal proportion (54 in each). The proposal recruiting period is 12 months and the follow-up will be performed at 1 month, 3 months and 6 months after surgery.

Inclusion Criteria:

1. Subjects and/or their legal guardians will be informed of the nature of this study and agree to participate in this clinical trial in accordance with all terms of this study.Signed the informed consent approved by the ethics committee, agreed to accept the postoperative treatment program, and completed the follow-up and related examinations as required by the follow-up;
2. Aged from 1 to 60 years old, weight more than 10 kg, male or non-pregnant women;
3. VSD effective shunt ≥3mm, ≤14mm;
4. Distance between the edge of defect and the right aortic valve is more than 3mm, no aortic valve prolapse or moderate aortic regurgitation.

Exclusion Criteria:

1. Irreversible pulmonary vascular disease;Severe pulmonary hypertension with bidirectional shunt;
2. Bleeding disorders or known clotting disorders (including heparin-induced thrombocytopenia),contraindications to antiplatelet therapy, or rejection of transfusions;
3. Sepsis or severe infection within 1 month prior to occlusion;
4. Patients with thrombosis at the occluder placement and venous thrombosis at the catheter insertion site;
5. Cardiac malformation dependent on ventricular septal defect (VSD);
6. Not suitable for treatment with this product.