The sources of problems for the pre-stressed concrete hybrid truss arch bridge are discussed.The shortage of construction connection,intensity analysis method and internal force adjusting are revealed.The stress superposition method is adapted to evaluate the bearing capacity of the old and dangerous hybrid truss arch that is divided into several construction stages.A finite element model is set up and verified by an example.The characters of the truss and arch are compared.According to variety of internal force of the inclined bar,a reinforcement scheme that the inclined bar is replaced by the cable is also advanced.Its theoretic feasibility is verified.