Abstract: The work in the fi eld of highway itself is highly comprehensive, and the factors aff ecting the quality of related projects are complex and diverse, in order to fundamentally improve the quality of highway projects, the use of high fill technology is extremely important. The efficient implementation of this technology can reduce the risk problems caused by various natural factors in the construction, and fundamentally reduce the construction risk. Based on this, this paper analyzes the main problems affecting the quality of high fill subgrade, and studies the main ways to improve the quality of high fi ll subgrade, for reference.