The number of steel bars in reinforced concrete shear walls is generally large while the diameter is small, making the workload of connections heavy and the quality difficult to guarantee in assembling. In such a case, the longitudinal reinforcement combined connection is a possible solution. Based on the section design method, the feasibility of the longitudinal reinforcement combined connection is analyzed, which is verified through the quasi-static test of three shear wall specimens. The mechanical behavior of assembled reinforced concrete shear walls with different connecting rebars is analysed by finite element simulation method. The results show that the assembled reinforced concrete shear walls with connecting rebars equalizes to the original reinforcements in terms of area and strength and evenly distributed along the wall length still exhibit good seismic performance. It is indicated that the ductility of shear walls with connecting rebars in edge members may be reduced. Therefore, it is advised to adopt it with caution. It has little effect on the in-plane mechanical properties of shear walls to combine the distributed steel bars by connecting rebars, which is a more reasonable way of combining connections, but the location of the connecting rebars should be evenly distributed along the wall length rather than concentrated near the neutral axis. The out-of-plane mechanical behavior, crack resistance and impact resistance of the assembled reinforced concrete shear wall with longitudinal reinforcements combined by connecting rebars are not considered in this study, which should be taken into account in furthor application.