Abstract: The majority of patients with malignant tumors have hypercoagulable state, which easily leads to thrombosis, and is closely related with recurrence of tumor metastasis. The formation mechanism of hypercoagulable state is related to tumor, tumor treatment, complications etc. The main diagnostic indicators are the platelet, cruor and fibrinolysis, Pselectin and lysosomal protein, blood rheology. Tumor patients with the high risk of thrombus should use low molecular weight heparin. Thromboembolism should be prevented in bedridden patients with tumor and tumor associated operation. Tumor patients with venous thromboembolism should be given thrombolytic treatment. Tumor patients with hypercoagulable state should be treated by anticoagulant therapy combined with chemotherapy.

Key words: Neoplasms, Therapy, Universal precautions, Blood coagulation