Using the finite element method, the temperature field of high grade highway embankment was simulated and analyzed taking into account of climate warming. The relationship between the permafrost table and the embankment heights of 2.0, 3.0, 4.0, 5.0 and 6.0 m, respectively was studied, and the relationship between the thawing interlayers and the pavement widths of 14.0, 16.0, 18.0, 20.0 and 24.0 m, respectively was also researched. The results show that the height of embankment has the largest influence on the permafrost table and the width of the pavement has the largest influence on the thawing interlayer inside the embankment and basement among the factors impacting on the stability of the embankment. In order to satisfy the service life of 20 a, the reasonable height of the embankment is 4.26 m. The maximum width of the pavement is 6.0 m without the cooling roadbed methods. When the pavement width of the separated embankment is 12.0 m, the reasonable distance between the separated road beds is 35.3 m.