The mechanical properties， microstructures， fatigue properties and fatigue fractures of the conventional C-Mn wheel steels and the low- carbon low- silicon phosphorus/chromium-contained transformation induced plasticity（TRIP）steel were investigated. Results revealed that the new-type TRIP steel possessed similar yield strength ， tensile strength increased by 100~150 MPa and fatigue limit increased by 50~140 MPa，compared with the conventional C-Mn wheel steels. The fatigue limit increased with the increase of the tensile strength. The steel containing ferrite，bainite and retained austenite had a higher fatigue limit than the steel containing ferrite，bainite and pearlite or steel containing ferrite，pearlite and martensite-austenite islands.