The study presented herein focus on the geotechnical disaster occurred in the vicinity of Nantou county from the 921 Chi-Chi Earthquake, including fault movement induced deformation, pile failure nearby the fault zone and soil liquefaction. Based on the investigation results from survey and coring inspection of piles, the connection between damage level and its corresponding distance from the surface fracture of fault was probed. In addition, for well understanding the appropriateness of some familiar approaches applied in analysis of liquefaction potential, the borings data before and after quake were introduced.