© 2019 Architectural Institute of Japan. All rights reserved. In our previous paper, the static rigidity and the flexural strength at the joint of the lattice shell with the timber steel hybrid connection were clarified by static experiments and their effect on the buckling behavior of the entire roof was revealed by elastic buckling analysis. Here we examine the influence of the rotational stiffness of the connections on natural oscillation and earthquake response characteristics. Also the accuracy of the response spectrum evaluation using CQC method and the equivalent static seismic load are verified, followed by a simplified evaluation method proposal for the effect of rotational stiffness at connections.