A new kind of ultra high performance concrete containing limestone powder was studied in this paper. The results show that the compressive strength of the ultra high performance concrete containing limestone powder is higher than 120MPa; the hydration activity and the accelerating effect of limestone powder are obvious under the condition of high temperature. The limestone powder hydrated and formed calcium monocaboaluminate hydrates. The cost would be reduced when adding certain amount of limestone powder when confect ultra high performance concrete. It is economical and feasible.