The high precision simulation and strength checking of the connection structure in carbon fiber reinforced plastic (CFRP) high-speed carbody is a challenging problem. In this study, a bimodulus constitutive model for braided CFRP was put forth, and the bonded/bolted hybrid joint in the carbody was subjected to submodel simulation. First, the tunnel meeting case was used to simulate the mastermodel of the CFRP carbody. The boundary conditions of the stress concentration area were retrieved. The bimodulus constitution and boundary conditions were then inputted, leading to the construction of a fine submodel of the hybrid joint. The strength, deformation, and failure factors of the bolts, adhesive layer, and CFRP plate were verified and assessed at the end. This work offers a fresh concept and methodology for the design and simulation of the CFRP connection structure in high-speed carbodies.