Research　findings　on　dynamic　characteristics　and　seismic　response　of　space　frames　are　introduced　in　this　paper.　It　has　been　found　that　the　response　of　space　frames　due　to　the　vertical　component　of　earthquake　is　larger　than　that　due　to　the　horizontal　component　of　earthquake.　The　theoretical　and　practical　methods　for　calculating　forces　in　the　members　of　space　frame　due　to　vertical　earthquake,　which　is　used　in　Chinese　code　of　space　frame,　are　introduced.