Half-blanking is one of the important features for fine-blanking parts. Therefore, in order to study the connection strength characteristic of the half-blanking feature, C20E carbon structural steel sheet with the thickness of 3.8 mm and 16MnCr5 alloy steel sheet with the thickness of 4.5 mm were used as experiment materials, the forming of I-shaped half-blanking feature and the shear failure experiments were carried out, and the influences of half-blanking depth, forming process parameters and feature shape on the connection strength of the half-blanking feature were analyzed. The research results show that before the half-blanking depth reaches the half-blanking limit depth of material, with the increasing of half-blanking depth, the connection strength of the half-blanking feature gradually increases, and finally tends to be stable. When the half-blanking depth reaches the half-blanking limit depth of material, the half-blanking feature cracks in advance. In addition, among the process parameters, the counter force and the clearance between punch and die have little influence on the connection strength, while the contact envelope area and the effective shear area of the half-blanking feature boss have a significant impact on the connection strength.