The mucky soft soil layer under the foundation of Lianyang Bridge-Sluice Reconstruction Project is deep and thick. The quality, schedule and cost of the project, are greatly affected by the selection of foundation reinforcement technologies, processes, and reinforcement plans, and determination of construction process parameters. Though comparative analysis, a reinforcement plan with dry jet mixing piles was adopted to reinforce the soft soil foundation of the project. Moreover, by reasonably selecting construction machines, determining the cement incorporation ratio and construction process parameters based on tests, the reinforcement quality of dry jet mixing piles (as long as 22 meters) on deep mucky soft soil was ensured. Economic and social benefits have been achieved. Experiences on soft soil reinforcement in this project may provide some reference for similar projects.