Hydatisosis caused by Echinococcus granulosus is more or less endemic in all sheep raising countries. This study evaluated omentoplasty versus partial cystectomy with drainage in surgical management of hydatid cysts of the liver in endemic area (Yemen). A total of 60 patients with hydatid cyst in the liver was divided into two groups; G1 (32 patients) treated with omentoplasty and G2 (28patients) treated with partial cystectomy with drainage (PCD). The results showed that the wound sepsis was seen in 6.25 %, of G1and in 14.2% of G2, biliary leakage occurred in 3.5% of G2, intra-abdominal abscess formation occurred in 3,5% of G2, atelectasis was in 3.1% of G1 and in 3.5% of G2. The total morbidity was
12.5% in G1 and 32.1% in G2. There was a significant difference between the two groups as regard to the mean post-operative hospital stay, (6.5 days in G1 versus 15.6 days in G2).