The invention discloses a drug used for antitumor, belonging to technical field of medication chemistry, which is characterized in that: 2-substituted-3-hydroxy-2, 3-xylylenimine-1-ketone (I), 6-substituted-5-hydroxy-5, 6-dihydropyrrolo [3, 4-b]pyridine-7-ketone (II), 6-substituted-5, 6-dihydropyrrolo [3, 4-b]pyridine-7-ketone (III), 6-substituted-5, 6-dihydropyrrolo [3, 4-d] pyrimidine -7-ketone(IV); the general formula of the structure is as above. The drug used for antitumor has the advantages of having higher protein kinase inhibitory activity, easily preparing, conveniently getting raw material, easily realizing industrialization and meeting requirements of preparing drugs treating cancers clinically.