A specific type of bismaleimide resin (BMI) was synthesized and a kind of epoxy resin was formulated to prepare Z-pins reinforced by T300 carbon fiber with diameters of 0.3 mm and 0.5 mm, respectively. Glass transition temperature (Tg) was measured by dynamic mechanical thermal analysis (DMTA) and interlaminar shear strength of Z-pins was tested by short beam shear method. The combination force between Z-pins and laminates was characterized by a special pullout test. The adhesion force/maximum pullout force per unit area between Z-pins and laminates was compared and the combination forces between the Z-pins and laminates were characterized. The results showed that Z-pins based on BMI resin exhibited higher interlaminar reinforcement effect toward T700/5429 composite, concluding that co-bonding between Z-pins and prepreg plays an important role in reinforcing the laminated composites.