Abstract: Eulecanium gigantea and Eulecanium kuwanai occure one generation a year in Huhhot, they spend the winter in the trunk. They have two kinds of natural enemies: Blastothrix sericae Dalman and Beijing utila Yang. The scale insects are less noticeable, developing fast and reproducing quickly. And Eulecanium gigantea belongs to quarantine objects of plants in the forests. So any one way can’t control them, all the ways should be used. The control of scale insects in huhhot should be used the principle of integrated control.