Abstract: My country has a vast territory and many remote mountainous areas. Therefore, high-speed railways inevitably exist in high-filled sections with subgrades higher than 8m due to topographical and geomorphological reasons, engineering cost reasons, and climate and environmental reasons. For the roadbed of my country's high-speed railway, most of the coarse-grained fillers are currently adopted. The coarsegrained fillers are higher than the fine-grained fillers in terms of compaction performance and compression deformation, which has a very broad application value. To this end, this article relies on the DK92+993-DK110+833 high-speed railway section of Wei-Yan railway to study the high-fill subgrade coarse-grain filler technology and settlement control, and systematically study the high-speed railway through the method of combining theoretical analysis and data analysis and calculation. Coarse particle filler technology and settlement control for high-fill roadbed.