<正> From July 1988 to May 1991

the authors had used the microwave tissue thermo-co-agulation method（MTTC）to treat 76 cases of large cavernous hemangiomas in the oro-maxillo-facial region.When a microwave antenna-pin was inserted into the tumor

blood and tissuewithin the tumor began coagulating due to high temperature produced by the mierowave ma-chine.Along with a full coagulation

the tumor may be removed surgically without bleeding.This method has many advantages:（1）less bleeding with little need of blood transfusion;（2）convenience for excision;（3）time for operation markedly shortened;（4）suitability for opera-tion-contraindicated patients.The authors consider that the microwave tissue thermo-coagula-tion method is a rather ideal method for treating large cavernous hemangiomas in the oro-maxil-lo-facial region.In this paper are reported 76 eases of clinical application and animal experimentof microwave tissue thermo-coagulation influences on the muscles and vessels.