In Korea, the fire resistance of main structural members of a building has to be investigated by a fire resistance test. In Europe, that can be determined by calculating the limit temperature concerning the load ratio or by using the finite element method such as Advanced Calculation Method. On this study, the fire resistance of Asymmetric H-section Slimflor Beam known as having good fire-resistance was checked by Advanced calculation method and the result was compared with the fire test data to verify the accuracy. Then, the changes of the fire resistance were investigated when the load ratio changes and the limit temperatures of the bottom flanges were presented for every load ratios.