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The effects of Ti microalloying on the microstructure and mechanical property of Mn18 steel were studied， and the reasons for the failure of Mn18 hammer heads were analyzed. The results show that Ti microalloying has the effects of refining grain， increasing impact toughness， elongation， strength and hardness in Mn18 steel. When 0.10% and 0.30% w［Ti］ are added to Mn18 steel， as the Ti content increases， the hardness and strength of high manganese steel increase，and the impact toughness and elongation also show an optimization trend. When it continues to increase Ti to 0. 51%， in addition to the continuous increase of Brinell hardness， the KU2 value and stability， strength stability， the elongation and other indicators all have a downward trend. High manganese steel belongs to high nitrogen austenitic steel， and after adding Ti， a large amount of TiN is rapidly precipitated as a heterogeneous core， playing a series of beneficial roles. If the addition amount is too large， the size of TiN type inclusions is too large and local aggregation occurs， which has a negative impact on the performance stability of Mn18 and is easily prone to fracture and failure of Mn18 steel hammer heads. To ensure its beneficial effect， the content of Ti microalloying used in Mn18 steel should not exceed 0.30%.