CSM Method, that is double wheel milling deep mixing technology, is a new type of technology. A good job of the cement soil quality control and the related preparation work should be done to ensure the construction quality of CSM method before the construction. In construction process, the trenching verticality, cement in cement slurry, water cement ratio and grouting volume, milling drilling speed and double wheel revolution, overlapping length and quality of structural steel inserting must be under control.