The crossflow effect was considered on crossflow transition. The original γ-Re<SUB>θ</SUB> transition model was applicable 3 dimension transition analysis, but this transition model was not enough considering crossflow effect. In the present study, improved transition transport equation was developed for simulating 3 dimension crossflow transition phenomena in infinite swept wing configuration. The experimental data using infinite swept wing were used for comparison with numerical results for crossflow transitional flow. The infinite swept wing consisted of NLF(2)-0145 airfoil and 45° sweep angle. The swept wing was tested at ?4° angle of attack and Reynolds numbers from 1.92×10<SUP>6</SUP> to 3.73×10<SUP>6</SUP>. The measured transition locations compared remarkably well with computations using improved transition transport equation for all investigated flow cases.