Abstract: The displacement field of sand underuniformly distributed load is measured by meansof digital image relative analysis, and the measuredresults axe compared with the Boussinesq's calcu-lationed ones. The result indicates that the test issatisfactory. This method is fiIst successfully ap-plied to the test of the displacement field of soil andis a new method in measuring deformation in soilmodel test, and is also a more effective means forthe study of geotechnical engineering and founda-tion engineering.