Nickel-based elastic alloy had excellent corrosion resistance and high temperature mechanical properties.The inclusion defects in the alloy seriously affect the yield of wire in the preparation process.The inclusions in NiCrWCo alloy were studied by scanning electron microscopy and energy spectrum analysis，and the sources，types and formation mechanism of inclusions were analyzed.The results show that there are granular or chain-like Al₂O₃，TiCN，TiC，WC，Cr₂O₃，Al₂O₃ and other inclusions in the NiCrWCo alloy.The particle size is 1.5-3.5 μm，and the chain length is 3-15 μm.The causes of inclusions are mainly due to the low purity of metallurgical raw materials，insufficient gas protection in smelting process and solidification segregation in cooling process.Finally，the inclusion control scheme is discussed from the perspectives of raw materials for smelting，furnace lining contamination，and vacuum control during smelting.