Abstract: Compared with the urban rail transit lines, the design requirements for urban rapid rail are higher, but the Bi-block track structure can further improve the safety, stability and comfort of rail transit lines. According to the technical characteristics and operational requirements of a Guangzhou urban rapid rail line, the scheme of Bi-block track sleeper structure for Guangzhou urban rapid rail is designed with the reduction of temperature shrinkage stress of concrete as the principle, and the reasonable round radius value of Bi-block track is determined. Then, a mechanical analysis model of Biblock sleeper under stacking state is established, and the influence law of reinforced concrete truss parameters on the mechanical properties of sleeper stack is studied. Finally, taking the relatively small equivalent stress of reinforcement and the amount of steel bars as the optimization target, reasonable structure parameters of the Bi-block sleeper reinforced truss are proposed.