Ｔｉ－Ａｌ合金相图因其金属间化合物优异的高温性能目前受到广泛研究，本文根据余氏理论的平均晶胞模型及键能公式，分析了间隙元素对Ｔｉ－Ａｌ系α，β，γ（ＴｉＡｌ）相价电子结构的影响，计算了间隙元素对这些相变点温度的影响。结果表明，间隙元素使Ｔｉ－Ａｌ合金某些相变点降低很大，从而解释了一些有争议的实验结果。 Ti-Al alloy phase diagram due to its excellent high-temperature properties of intermetallic compounds are widely studied. According to the average unit cell model and the bond energy formula of Yu’s theory, the effects of interstitial elements on the α, β, γ TiAl), the influence of interstitial elements on the temperature of these phase transition points was calculated. The results show that the interstitial elements reduce some of the phase transition points of the Ti-Al alloy greatly, thus explaining some controversial experimental results.