Abstract: In order to explore the influence of high-altitude and low-oxygen environment on the power performances of construction machinery, the construction transportation machinery is taken as the studied object, and the influence of altitude change on the power performances of construction machinery is studied by measuring the traction specific power. At the same time, traction specific power is used as a quantitative index of working efficiency of construction transportation machinery, and the regression model of altitude-working efficiency reduction coefficient of construction machinery and the regression model of altitude- consumption adjustment coefficient of construction machinery shift are established. The study results show that the higher the altitude is, the worse the power performance of machinery is. The traction specific power of construction machinery at 4 200 masl (above sea level) is 23% lower than that at 2 800 masl, and the working efficiency of machinery at 4 200 masl is 23% lower than that at 2 800masl. The higher the altitude is, the greater the consumption of machinery shift is, and the consumption of machinery shift at 4 200 masl is 24% higher than that at 2 800 masl.