The present invention relates to a modified starch and a method for obtaining the modified starch by using a debranching enzyme, such as isoamylase, pullulanase, limit dextrinase and the like. The debranching enzyme modified starch of present invention exhibits excellent film-forming capacity, film strength, and gelation ability, so as to be used as a material for making hard capsules without the use of coagulants and plasticizers.