Due to complex and alternative impact load action during service the flaking and spalling occurred at sur- face of high manganese steel 1. 14C- 12.72Mn led to failure ahead of service time. With finite element analysis on internal stress conditions of railway frog by software ANSYS 8.0 it was obtained that maximum vertical stress at surface of frog was up to 5381 MPa while horizontal stress was 2450 MPa with hardened layer depth 15 mm; and shearing stress was 700 MPa with depth 1.5 mm which accelerated the surface flaking and spalling of railway frog. Microalloying of high manganese steel is available to fine grain and increase toughness of materials to prolong the service life of frog.