[Objective]To study the methods and opportunity of operation for the malignant tumor intercurrent fracture of extremity.[Method]Seventeen cases of malignant tumor intercurrent fracture of extremity were reviewed in our hospital from June 1996 to October 2003 in the study,which included osteosareoma 4 cases,giant cell tumor 3 cases,ewing tumor 1 case,ametoblastoma of bone Ⅰ case,bony metastases 8 eases.4 cases treated with exterior fixation and chemotherapy in Ⅰ P(period)and reconstruction alter tumor cutting in ⅡP(period),11 cases treated tumor eliminate and reconstruction in Ⅰ P(period).One case amputed in Ⅰ P(period)and 1 case amputed in Ⅱ P(period).[Result]All patients treated had been followed up from 12 to 88 months.One case occurred local rccurrrenee.and 2 cases died because of lung metastases in the 9 cases of primary malignant tumor.While 1 case occurred local reecurrenee and 4 cases died in the 8 cases of metastasis malignant tumor.[Conclusion]For the primary,malignant tumors with fracture.which were sensitive to chemotherapy,should first take into account to exterior fixation and chemotherapy inⅠ P(period)and reconstruction after tumor cutting in ⅡP(period),while for the insensitive giant cell tumor and bony metastases with fracture should be treated with tumor eliminate and reconstruction in ⅠP(period).