The traditional ultimate bearing capacity formula is verified through numerical analysis in this essay. It is shown that the contribution of base width to ultimate bearing capacity in traditional formula is correct. Through the numerical analysis
aiming at the contribution of base width limitation to foundation bearing capacity in code method
we studied a reasonable method for ascertain the bearing capacity
and we believe that determining the bearing capacity of soil with settlement and safety factor of the real foundation is more reasonable. The reflection of the bearing capacity of soil from base width has already effect the settlement and safety factor
therefore we can receive the bearing capacity of soil more reasonable with no necessary to limit the base width.