The vacuum gradient can be controlled to meet the design requirement of the ground stabilization and the cost can be decreased correspondingly in the application of surface-layer vacuum preloading technology.Based on the treatment engineering of soft foundation in Yueqing bay region,Wenzhou,we carry out a comparison and analysis on the same arranged vacuum pumps and different gradients of working pumps depending on the monitoring and inspected results.It shows that the vacuum gradient should be adjusted according to the degree of consolidation during corresponding course,which can obtain good performance.