In order to study the mechanical behavior and stress state of the high strength bolt friction grip long joint, fourteen different bolted connections are studied with the three-dimensional finite element analysis which is based on the general FE software ANSYS. The force-delivering ratio of each bolt, the stress concentration at the edge of the bolt hole, the stress state of the high strength bolt and the force-delivering coefficient before the bolt hole are specially studied. Also, the ranges of these parameters’ value are presented clearly. The results presented would be useful as references to these type joint's design and computation.