Abstract: A case history study on the B za 19-2 pile base accident of the Xiewang Grade-Crossing-Elimination Bridge of highway surrounding Xi'an shows the technologic process of accident treatment,including bore drilling for determining the defect section;bottom-hole cleaning and recording related data near defect section with ultrasonic inspection;reinforcing defect section using high pressure rotary jet grouting;comparing and evaluating the treatment effect,determining with ultrasonic inspection.It is also discussed that the application conditions of static pressure grouting,rotary jet grouting;chemical grouting with strength-producing cementing material,grouting of reinfored steel,grouting of pretensioned cable anchor and the periphery reinforcing with rotary jet grouting.In the end some existing problem are presented.