Abstract: This paper is based on the mountain silt-sand mixed soft soil foundation of Jing-mu highway project. Through technical comparison and economic analysis of the treatment programs of the soft soil foundation about the Pine pile, the CFG pile (Cement Fly-ash Gravel Pile) and the Cement Deep Mixing pile are made so as to select the best treatment program. The study shows that the cost of the Pine pile is the highest among the three treatment programs of the soft soil foundation which is limited by the processing depth and the bearing capacity to be chosen as the best option. Under the same conditions, the cost of the CFG pile is so much expensive as to 1.4 times that of the cement deep mixing pile. Finally, cement deep mixing pile is chosen to handle the silt-sand mixed soft soil foundation in this project.