Abstract: Puzuo is a critical part of Yingxian Wooden Pagoda. It is an integral component formed by the interlocking of bidirectional (Nidaogong and Huagong directions) components through mortise and tenon joints and concealed tenons, which exhibits significantly spatial structural characteristics. To investigate the spatial seismic performance of Puzuo, three scaled models of Zhutou Puzuo in Yingxian Wooden Pagoda with a ratio of 1∶2.5 were fabricated. Quasi-static experiments under constant vertical load were conducted to assess the seismic performance of this Puzuo, with the horizontal unidirectional (including Nidaogong and Huagong directions, respectively) and bidirectional loading. The seismic performance of Zhutou Puzuo under horizontal unidirectional and bidirectional loading conditions were compared by analyzing the deformation characteristics, failure modes, load-bearing capacity, and energy dissipation capability. The test results indicated that when subjected to unidirectional loading along the Nidaogong direction, there was a notable interlayer slipping phenomenon in the middle of Zhutou Puzuo. Meanwhile, Ludou and Nidaogong rotated along the loading direction, and cracks successively appeared along the grooves on the left and right sides of the 2^nd Zhutoufang, Mangong, and Nidaogong. When subjected to unidirectional loading along the Huagong direction, the interlayer slippages of Zhutou Puzuo were extremely small, and the rotational amplitude of Ludou during negative loading was greater than that during positive loading. Moreover, severe transverse cracking occurred at the grooves of Ludou and compression deformation were observed in Mandou tenon along Huagong direction. When subjected to horizontal bidirectional loading, the interlayer slipping characteristics of Zhutou Puzuo in both horizontal directions were basically identical with that under the unidirectional loading, but the slippages were larger. Rotational deformations occurred in components (e.g., Ludou, Nidaogong, and Huagong), and the entire Puzuo rotated along the diagonal of the two horizontal directions. Compared to unidirectional loading, it exhibited smaller loading displacement and greater rotational amplitude when rotation occurred. The locations and characteristics of damage on components in both horizontal directions were similar to those under unidirectional loading, but the unidirectional displacement when damage occurred was smaller. In the Nidaogong direction, the maximum horizontal load-bearing capacity decreased by 15.14% during positive loading under horizontal bidirectional loading, while it remained approximately identical during negative loading. The dissipated cumulative energy decreased by 22.56%. In the Huagong direction, the maximum horizontal load-bearing capacities during positive and negative loading and the dissipated cumulative energy under horizontal bidirectional loading decreased by 18.85%, 12.22%, and 18.27%, respectively.