Composite materials not only have good mechanical performances but also have excellent durability and ability to be formed into complex shape. So advanced composite materials are used extensively in ship industry. In the composite ship structure the T-joint is one of the common joint in practice. As the main load-bearing structure of ship, the mechanical and reliability designs of T-joint are the important aspects of the ship structure design. The traditional composite T-joint is bonded joint, and adhesive strength has obvious influence on the properties of T-joint. To improve the properties of composite T-joint, in this paper the bolted composite T-joint is chosen for studying. Finite element method is used to investigate the properties of bolted T-joint. The influences of bolt-clamping load and friction coefficient on the stress distribution of bolt-hole edge are investigated. Some conclusions can be used as references for the design of bolted composite T-joint.