To avoid collision damage to the water stop at structural joints during earthquakes and prevent water leakage that endangers the safety of ships and personnel in the aqueducts, a novel bidirectional restrainer which bears the collision force instead of water stop and prevents the damage of water stop has been developed, and a design method based on capacity protection for this restrainer has been established and preliminary verified by finite element analysis.Static tensile experiments of this device are carried out.Through the experiments and corresponding finite element analysis of the restrainer, it is further verified that its design concept and method are practical and safe.The analysis of ultimate load-bearing capacity and the elastic upper limit(yield point)is performed.The results show that the ultimate load-bearing capacity is determined by the material failure caused by the local stress of the contact surface on the part with fewer plates reaching the tensile strength of the material, but it does not affect the determination of the elastic upper limit, and the control effect of the bending deformation of the pin on the whole deformation of the device and its protective effect on the plate.The elastic upper limit of the device is controlled by the whole deformation curve.The safety factor of the design method of this novel restrainer based on capacity protection is 1.73.