The problem to imitate a camber often needs to be solved in soil survey.So-called imitating camber is to calculate the attribute data of whole grids in research area based on a limited amount of sample attribute data such as elevation data, underground water depth, soil pH.This is a classical mathematical theory problem.This paper gives a new method to imitate camber, which combines fractal theory with digital filtering and is fit to process the complicated case with a separating zone.