Automaticextractionofroadandlinearstructurefromremotesensingimagesisaveryimportantproblem.Thispaperanalysesseveralexistingmethodsoftheautomaticroadandlinearstructureextractionbyusingsomemulti-spectralremotesensingimagesacquiredfromdifferentspatialresolutions,districtsandroadcharacteristics.Theiradvantagesanddisadvantageshavebeengeneralized.