Abstract: To explore the influence of stressed crack of cracked balanced-reinforced hollow slab in elastic phase on structural static and dynamic characteristics, the mechanical characteristics of a 20-metre balanced-reinforced hollow slab were researched by a load test and nonlinear finite element analysis. The load test was carried out by multi-stage loading and the finite element analysis was performed by Midas FEA nonlinear static analysis. Results show that the damage of overweight vehicle has ocuured before the applied load meets the designed load, which can be observed by the decreasing stiffness, and increasing deflection and strain. The structrual stiffness of cracked hollow slab in elastic phase does not vary obviously without a higher applied load, and the slab can meet the design requirements with an applied load lower than the design load, whereas has a lower safety stock with the applied load higher than the design load. The dynamic characteristic reflects structural damage with a lower sensitivity level compared to static characteristic.