For the induction motor and inverter type motor design, prediction and analysis of core loss including higher harmonics have been studied. In this work, we have generated two symmetrical ac minor loop in the fundamental hysteresis loop whose positions are zero induction region and saturation induction region, and we could pre-dict core loss including higher harmonics inductions. using the following modified superposition principle; P_c(B₀, f₀, B_h, nf₀)=P_c(B₀, f₀)+(n-1)[K_I(B₀)P_cL(B_h, nf₀)+(1-k_I(B₀))P_cH(B_h, nf₀)]. Using this equation we could also analyze core losses including higher harmonic induction under different maximum magnetic induction, different amplitude of higher harmonic induction with different harmonic frequencies.