The paper examines interlaminar properties of laminated composites experimentally and numerically. Short beam shear (SBS) and double cantilever beam (DCB) tests are first conducted to measure interlaminar shear strength (ILSS) and mode I fracture toughness of composite laminates. The experimental results revealed that the ILSS is sensitive to thickness, and the DCB load-displacement curves display explicit stick-slip behavior. Progressive delamination models are then generated based on bilinear cohesive zone model (CZM), and 3D Hashin failure criterion to simulate the interlaminar delamination process of the SBS and DCB samples. The predictions have good agreement with experimental findings, demonstrating the practical and effective use of the proposed model in the paper.