Aiming at the problem that the time limit of reinforcing fresh hydraulic reclaimed mud with secondary treatment technology is short but the construction cost is high,a new one-time treatment technology of vacuum preloading for dredged silt foundation is put forward.Three key technologies are introduced in detail from the aspects of construction process,technical parameters,material performance parameters and key points of construction:new type of large-area sand bedding,new type of vacuum preloading drainage system and graded vacuum preloading technology.Based on the general analysis of the reinforcement effect and the direct construction cost of the technique,the results show that the reinforcement effect of the technique is better and the relative cost of the secondary treatment technology is significantly reduced.