Abstract: The anisotropy of horizontal permeability coefficient causes an elliptical contour of the water level drop when pumping, which further results in an elliptical land subsidence funnel. The phenomenon of this elliptical land subsidence funnel exists widely. For homogeneous isotropic aquifers, circlular land subsidence contours are round, and subsidence and distance coincides with the rules of linear s- relation. The relationship of linear s- is suitable for homogeneous anisotropic aquifers too. While land subsidence contours are elliptical for homogeneous anisotropic aquifers. In equation of , and are coefficients. For each radial line of subsidence contours, the relation between coefficients , and angle θ of radial line is founded applying groundwater hydraulics. The coefficients , are in proportion to square of or square of . The formula is proved by monitoring data from 6 regional land subsidence located in China, American and Indian. These monitoring data have great agreement with the new formula of , and . One correlation coefficient between , and is 0.871 9, the other 11 correlation coefficient are all greater than 0.9. The character of elliptical land subsidence due to horizontal anisotropic permeability is represented. The formula of , and has simple form. So it is easy to apply in engineering. The formula can be used to predict the vertical displacement for land subsidence.

Key words: permeability, anisotropic, subsidence funnel, elliptical