Univ Toronto, Dept Phys, Toronto, ON M56 1A7, Canada
; CCAST, World Lab, Beijing 100080, Peoples R China
; Inst High Energy Phys, Beijing 100039, Peoples R China
We take the standard model to be an effective theory including higher dimensional operators suppressed by a scale Lambda and reexamine the Higgs boson mass bounds from the requirements of vacuum stability. Our results show that the effects of the higher dimensional operators on the Higgs bosan mass limits an significant. As an implication of our results, we study the vacuum stability Higgs boson mass bounds in theories with extra dimensions.