【Objective】In order to provide a little basis for improving the settlement maintenance standard of double block ballastless track, the uneven settlement damage problem of double block ballastless track subgrade is studied.【Method】A three-dimensional finite element model of double-block ballastless track with uneven settlement of roadbed is established, it aims to analyse the spatial stress and the deformation law of each component of the track structure under the action of roadbed settlement. On this basis, a static damage classification and evaluation method for differential settlement of double block ballastless track subgrade is proposed.【Result】The results show that when the settlement wavelength is 20 m, the amplitude has a great influence on the stress-deformation and inter-layer seam of the track structure. The settlement amplitude is 10, 15, 20 mm and above, and the damage rating is Ⅱ, Ⅲ and Ⅳ respectively. When the settlement amplitude is 10 mm, the smaller the wavelength is, the easier the void phenomenon is to occur among the layers of the track structure. The settlement wavelengths of 12~16 m have a great influence on the damage of track structure, and the maximum longitudinal tensile stresses of track slab exceed the limit value 3.50 MPa. So, it is recommended that the settlement damage rating of wave band below 20 m is the grade Ⅲ, and that of wave band above 20 m is grade Ⅱ.【Conclusion】In order to facilitate the“scientific repair and accurate repair”of high-speed rail intelligent operation and maintenance, it is suggested that the settlement damage level should be associated with the static geometric allowable deviation management value of the line track, the maintenance level should be consistent with the damage level, and the comprehensive maintenance of settlement should be controlled within 15 mm.