Abstract: Several reference land-value grading and evaluating methods are introduced,which the sample point interpolation method is fast,simple and easy to be updated.It can be generally implemented on the basis of computing the shortest path,which is improved in this paper.Because of the more accurate shortest path and distance between any two points,precision of the whole land-value attenuation model is improved also.Based on the shortest path,displacement-mean method is used to carry out the spatial interpolation ...