From October 1, 1964 Japan's first high speed railroad traffic so far, after forty DuoNian development, high-speed rail with its rapid, safe, economic and environmental protection, and other aspects of the obvious advantages. At present in the world scope of high speed railway construction is in the ascendant, technological progress is more with each passing day. High speed railway passenger special line that is required GaoPingShun sex and high stability of the rail, stable, settlement and settlement of small even smooth GaoPingShun sex is the track of subgrade foundation. And the stability of roadbed, main is to rely on good roadbed post-construction settlement and the uneven settlement to control. Our homeland is a large country, topography and geology condition is very complex, and there are a lot with special material composition and structure, and engineering geological properties of a special soil. Embankment is the foundation of the railway and highway, must have the enough strength and stability, and so on through the special land area with high quality requirement of roadbed. Only in the bounderies stratum situation, make sure foundation conditions can be conducted only meet the requirements of the filling the road embankment, or should be for reinforcement. This paper mainly introduces the long period of special passenger line guizhou soil subgrade construction technology research, with soft soil, soft soil and the red clay primarily. No zha rail area all soil foundation are subject to an stability and post-construction settlement analysis, post-construction settlement must meet the requirements specification. When the subgrade stability, post-construction settlement or post-construction settlement difference value is not satisfy the standard requirement, the need of foundation reinforcement. Reinforcement measures mainly has WaChu change fill, mixing pile, water soil learn a lot from mixing pile, CFG pile and high pressure jet grouting pile, prefabricated concrete pile, fill preloading method, this paper make a list of various methods, the applicable condition, the construction preparation, technical requirements, quality control and quality inspection, the points for attention, etc. And through various subgrade treatment method of the applicable condition, the condition, advantages and disadvantages, the comparison of the final CFG pile, and the advantage in the long period of special guest designed guizhou soil subgrade construction, is widely used in the most economic and reasonable construction technology of one.