Abstract: A combination of proposed static tests and numerical simulations was used to investigate the influence of horizontally distributed reinforcements (vertical joint connection reinforcements) on the force performance of Geam assembled monolithic shear walls. The test objects include one cast-in-place concrete shear wall and two Geam shear walls, and the damage mode, the bearing capacity evolution, the stiffness degradation and the joint damage of each specimen were comparatively analyzed. The study results show that: the cast-in-place specimen suffers from brittle shear damage; the Geam shear wall specimen exhibits a two-stage damage mode, which maintains the working characteristics of a monolithic wall before the peak load, and then gradually transforms into the working state of a slit wall, and the emergence of macroscopic vertical cracks avoids the brittle shear damage, so that the shear wall has a certain degree of ductility and energy-consuming capacity. The connecting reinforcement bars of the Geam shear wall at the vertical joints yield at the peak load, indicating that the joint detailing is reasonable and can effectively ensure the integrity of the wall. When the reinforcement ratio is kept constant and the horizontal reinforcement spacing is increased from 200 mm to 300 mm, the load carrying capacity of a Geam shear wall is basically unchanged, the cracking displacement angle of vertical joints is reduced, the misalignment deformation is obviously increased, and the equivalent viscous damping coefficient is increased by 18.9%. The finite element simulation results show that the peak load carrying capacity of a Geam shear wall is basically unchanged by increasing the horizontal distribution bar spacing, and that the reinforcement spacing can be adjusted according to the engineering requirements in practice engineerings.