A local injection therapy of Bleomycin has been performed to the 24 brain tumors as a supplementary therapy. Then its effects and pathological findings are reported. In the cases ended up with subtotal or partial removal, On-unaya's device was detained in the tumor bed or cyst, and the specific abovementioned therapy was started on the 7th day when the postoperative condition was stabilized.On an averege from 0.1mg/kg to 0.2mg/kg of Bleomycin was injected by percutaneous puncture into its reservoir every other day. To the malignant gliomas, Co50 irradiation and vaccination (SSM) were used together with this therapy. In 4 of 5 craniopharyngioma and one recurrent oligodendroglioma, the remarkable clinical effects have been obtained. But only one case of paracellal meningioma was not showed on clinical effects.As for intraventricle tumors, Bleomycin was injected through the V-A shunt valve, but the therapy was not successful and the patients died after the recurrence.On the other hand, most of the patients with the malignant gliomas died due to their recurrences about one year or so in spite of temporary clinical improvements.But each case of reticulum cell sarcoma and medulloblastoma survived longer.From the 13 autopsied cases of malignant gliomas, the similar pathological findings were obtained around the tumor bed. On the macroscopical findings, hemorrhagic infarction is shown from the convexity to the depth of the white matter, and in the deeper part, the tumor tissues were actively increasing. On the microscopical findings of necrotic tissues, there are hyaline fibrous membrane, fibrin, severe coagulation necrosis of tumor cells with hemorrhage, increasing capillary vessels, and infiltrating lymphocytes and granulocytes.Consequently, the scintillation scanning of Bleomycin labeled Co57 was utilized to study the state of widespreading and invading in the three patients of glioblastoma along with the same injection method. Bleomycin labeled Co57 was still stated into the tumor bed at the 8th day after the injection.In the pathological and radiological findings, it was estimated that the tumor cells were almost necrosed tissues by the injected Bleomycin in the easy stage, but in due time, the fibrous tissues were formed.For this reason, the Bleomycin was not enable to invade into the deep tumor cells, and the efficacy could not be exhibited enough.In conclusion, I realize that the subtotal removal must be performed on gliomas before introducing this local injection therapy, because I could have Bleomycin invade into the rest of tumor cells.