The deformation and stress in-situ monitoring plan of representative section of Wuhan-Guangzhou railway passenger dedicated line in China was introduced. The monitored compressions of piles and soil between piles in different depth were analyzed. Then deformation development trends of piles and soil among piles in CFG pile composite foundation was investigated following the construction processes of railway subgrade, namely, filling, rest of loading, surcharge precompression, unloading surcharge, and so on. Based on the tested vertical stress both of CFG piles and soil among piles, their developing trends were investigated for every construction phase, and the pile-soil stress ratio was researched too. In-situ monitored data shows that: (1) Under the filling height 6.2m, the tested settlement of composite foundation is 15.67mm, which proves CFG pile composite foundation is effective on control settlement of subgrade. (2) The compression of pile is not equal to that of soil among piles during subgrade construction, and their difference reduce gradually as a result of stress adjust in composite foundation, with the pile-soil stress ratio tend to one fixed value.
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