According to the requirements of oxidation resistance of new low-density Nb-Ti alloy， Si-Cr-Ti oxidation resistant coating was studied， focusing on the changes of oxidation resistance and microstructure of the prepared coating before and after oxidation. The results show that coating life is more than 10 hours at 1 200 ℃， and the thermal shock resistance of coating is good； A diffusion layer is formed between coating and substrate to ensure bonding strength of coating； In high temperature atmospheric environment， a glassy SiO₂ layer which can isolate oxygen and fill the gap is formed on surface layer of coating， so it has good oxidation resistance.