Although large numbers of attempts have been made to evaluate buckling strength of cylindrical lattice shell roofs under equally-distributed vertical loads, stability under seismic loads has not been studied enough yet. In this paper, evaluation method on buckling strength of cylindrical lattice shell roofs based on continuum shell analogy under equivalent static seismic loads proposed in the previous studies is investigated. First, the buckling behavior under distributed loads proportional to the static seismic loads is researched taking shape parameters into account. Next, the buckling strength for vertical loads and the buckling strength for static seismic loads is evaluated using continuum shell analogy, and converted to elasto-plastic buckling strength using knockdown factors and Dunkerley formulation. The effectiveness of the proposed evaluation is discussed against the results of time-history response analyses.