Abstract: The plasma Level of lipoprotein (a) (Lp (a)):total cholesterdol (TC)，triglyceride (TG)，Apolipoprotein B (ApoB) and ApolipoproteinA一I (ApoA一I) in 57 patients with benign tumors，52 patients "ith malignant parenchymatous tumors and 80 normal controls were observed. The re-suits showed that there were no statistic differences of the indices observed between benign tumorpatients and normal controls. Patients with malignant parenchymatous tumors had a higher Lp(a) and a Lower TC level compared with that in the other two groups，and a lower level of ApoB and ApoA一I with that in normal controls. It is considered that Lp (a) might excert a certain pro-motive effect on the growth and metastasis of tumors by affects the coagulating system. It is possi-ble that Lp (a) and TC might be used as biochemical indices in accessory diagnosis of malignant tu-morn.The relationship between tumors and Lipids，Lipoproteins or apoLipoproteins is worth fur-ther study.