To explore efficient and reasonable connection forms of precast hollow shear walls with boundary columns， and to address the challenges of connection construction and quality inspection， three horizontal seamconnections （boundary column connection by vertical additional steel bars， indirect lapping connection of U-shaped steel bars， and steel joint connection） were proposed. Quasi-static tests were carried out on three hollow shear walls with precast boundary columns， along with a cast-in-place hollow shear wall， to study the seismic and working performance of these connections. The results showed that the specimens exhibited a compression-bending failure mode，successfully achieving the expected “strong shear weak bending” behavior. The ductility coefficient of precast specimens was around 4. Compared with the cast-in-suit specimen， the energy dissipation capacity and deformation capacity of each precast specimen were slightly weaker. The limit drift ratio of the precast specimen was between 1/56 and 1/67， and the elastic-plastic deformation capacity met the requirements of the current code. Through-cracks were easy to form at the horizontal seam， but the horizontal shear configuration can meet the code requirements. The applicability of calculating the bearing capacity of the specimen based on the code was analyzed， and a calculation method considering the influence of horizontal seam was proposed.