The match filtering method has been extensively used in the processing of mag-netic data, with fairly good results obtained ia separating anomalies from the regional mag-netic field. Nevertheless, the method has rarely been used in the processing of gravitational data. This paper has made detailed theoretical derivation and practical verification and, for the purpose of testing and verifying the practical value of separating local fields from the regional field on the basis of practical gravitational data, has given some results of model test and practical computation.