Abstract: In this paper, the results of in-situ testing of the freeway of Xiamen city by surcharge precompression combined with vertical drains is introduced. The outcome of vertical-drains ground is evaluated. Based on the field test results, it is considered that, after strengthening by surcharge precompression, the post-construction settlement of the freeway of Xiamen city will be small enough to satisfy the strict requirement of ground deformation. The tests also show that the safety monitoring of the ground should be carried out according to the rates of settlements and lateral displacements, so the construction indexes should be carried out 20 mm/d and 10 mm/d.