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Objective To investigate the correlation between preoperative thromboelastography (TEG) parameters and routine coagulation tests of malignant tumor patients. Methods A total of 79 patients with malignant tumors, receiving preoperative TEG tests and routine coagulation tests between January 2019 and June 2020, were included. The correlation and regression between coagulation indexes and TEG parameters were analyzed. Results In patients with malignant tumors, the coagulation time(K) was negatively correlated with Plt and fibrinogen (FIB), while Angle, Ma, and G were respectively positively correlated with Plt and FIB. Conclusion There is a correlation between preoperative TEG parameters and routine coagulation tests in patients with malignant tumors. There is complementarity but not reciprocal substitutability between these two tests.