Objective To observe the change of perioperati ve endotoxin (ET) level and renal function in obstructive jaundice (OJ) patient and the effect of sodium cholate,lactulose, and anisodamine.Methods Forty-eight OJ patients were randomly divided in to control group(n=15), sodium cholate treatment group(n=11), lactul ose treatment group (n=10) and a anisodamine treatment group(n=12), 21 patients with cholecystolithiasis served as non-jaundiced control group. The levels of plasma ET and endogenous creatinine clearance rate (Ccr) were determi ned in all the cases.Results Compar ed with non-jaundiced control group, plasma ET level increased significantly an d Ccr significantly decreased in OJ group (P