The acceptor state density was calculated by a new method based on Heywang Model. By using the plot of natural logarithm of resistivity versus 1/epsilon(app)T, the acceptor state density of Yb-doped BaTiO3 was calculated. The doping effects of Yb and Mn were also investigated. Yb doped after preheating can decrease the acceptor state density and resistivity jump; Mn doped after preheating may increase the acceptor state density and resistivity jump.