Effect of Jian Yan Ling (JYL, mainly consisted of Succinum, Pteria margaritifers and Astragalus membranaceus etc.) on serum lipids was studied by double-blind method in 128 hyperlipemia patients. Patients were divided randomly into two groups, the test groups (64 cases) treated with JYL, while the other 64 cases treated with placebo as control for 3 months. Serum total cholesterol (TC), triglyceride (TG), TC-high density lipolipid-cholesterol (TC-HDL-C), apoproteins were observed before and after treatment. Results showed that the TC, TG, apoproteins and lipoprotein-a of test group were all dropped significantly after JYL treatment (P < 0.01). The results suggested that JYL could regulate the blood lipids and could also exert an effect of antiatherosclerosis through reducing blood lipoprotein-a level. It is worth while to use JYL as an antihyperlipemic agent clinically.