[17; 18] carried out an experimental study on four unbounded posttensioned masonry walls. The results show that the lateral strength of the specimen is influenced by the distribution of posttensioned bars, with the same total initial posttensioned force. The unbounded post-tensioning specimens are like rocking walls, and similar and relevant research was also carried out by [PERSON] and [PERSON] [19], [PERSON] et al. [20], [PERSON] and [PERSON] [21] and [PERSON] et al. [22]. Moreover, [PERSON] et al. [23] proposed a novel concrete masonry wall, called an ungrouted posttensioned confined concrete masonry wall with unbounded tendons, and the masonry panel was posttensioned and confined by the ring beam and constructional columns. The tests results indicate that the post-tensioning is significantly effective in improving the cracking resistance and seismic behavior of the walls. [PERSON] et al. [24] described and discussed previous post-tensioned concrete masonry research applications and post-tensioning construction details. [PERSON] et al. [25] applied the external prestressing technique on a masonry structure, and shaking table model tests were conducted. The experimental results show that prestressing influences the failure mode of masonry structures and improves their torsional resistance. Therefore, the above studies demonstrate that prestressing is a promising technique to improve the seismic performance of masonry structures. However, the tedious construction method associated with the unbounded technology and tension technology limits the application of the prestressing technology. [PERSON] and [PERSON] [19] carried out experiments with bonded poststensioned masonry walls but found that the deformation capacity and strength of the specimens was reduced. The reason for this is the bond stress between the poststension duct and surrounding grout. Thus, the influence of the poststension duct cannot be ignored. Furthermore, studies on the seismic performance of reinforced concrete masonry structures concentrate on single-story walls [26; 27; 28; 29], and little research has been carried out on collaborative work between two walls. [PERSON] et al. [30] discussed shaking table tests on a full scale, two-story, reinforced masonry shear-wall structure, with two T-sectioned and one rectangular-section wall components. The test results show that the walls in the orthogonal direction had a significant contribution to the lateral load resistance of the structure. [PERSON] et al. [31], [PERSON] et al. [32] and [PERSON] et al. [33] carried out a series of studies on the inelastic seismic response of reinforced masonry walls at the system-level by cyclic tests on individual components and within two asymmetrical building systems. The results show that the variation in the inelastic response of reinforced masonry walls comprising the buildings, and the interaction relationship between the walls and diaphragm cannot be neglected. In summary, there are still many problems and unknowns in the application of prestressing masonry structures. Based on the above, a new feasible prestressing technology has been proposed. To accomplish this, one end of vertical bar was machined by threads, and the other end was anchored in the beam or floor. Using the vertical hole in the hollow masonry wall, the vertical bar was fixed at the top of hollow masonry wall by anchorage plate and the prestressing force was applied by torque wrench. Therefore, in this study, the coupled masonry shear walls are selected as the research object, and the influence of prestressing technology on the seismic performance of reinforced concrete masonry walls was investigated using a cyclic test. Four comparison specimens with different section types and prestressing technologies were built, and a complete description of the failure mode and crack pattern of the specimens is presented. Seismic performance indexes, like the displacement ductility, stiffness degradation, energy dissipation and equivalent viscous damping, are discussed.