As a important form of connector and load-bearing structure, the connection property of composite
bolted joint directly affect the structure reliability. Against the anisotropism and progressive damage character, the
composite bolt and plate is modeled by finite element method. According to the written U-mat code, the progressive
damage process of composite bolted joint is simulated by numerical method, the load-displacement curves of bolted
joint are obtained, and the failure mode is studied in this paper.