In hepatic Lobetomy for 70 cases with hepatolith, drainages of abdominal cavity were performed for clinic- al study.From 1985 to 1985.34 cases with hepatolith were drainaged by dual cannuls(D.C group),and from 1990 to 1992,36 cases were done with parallel duel cath- eters(P.D.C.group). The ressults of comparison of these 2 groups show that P.D.C group has much fewer complications than D.C group and svere infectious complications,espe cially subdiaphragmatic.hepatic section infection,have been greatly decreased(P<0.01).Which provides basis for wide elinical application.