Abstract: For poor environmental and economic benefits of existing subgrade structure, a new type of pile-anchor-frame composite double-deck highway structure adapted to the steep slope topography in mountainous area is put forward and the static model test of the new composite subgrade structure is carried out. The model of 1:20 scale is established for the designed optimal structure by numerical simulation. Through the test, the displacement of the top of the anti-slide pile and the slope under the static load is determined and the slope supporting effect of the structure is analyzed. The force and deformation of every structure parts are measured, and the static stability and failure modes of the structure are analyzed. The variation and distribution of earth pressure in rear area of pile, pile bottom and basement under the action of pre-stressed anchor cable are measured. The experimental results show that the new pile - anchor - frame composite double-deck highway structure has good stability, small deformation and high bearing capacity.