Product Liability(P.L) is designed for system which charge with a compensation for demages that has nothing to do with whether manufacturer make a mistake or not in that case suffer heavy losses anyone of body or property by defect of product. Now and then, most people interest of safety of product and main countries already carry out Product Liability. This paper analyzes newly studied cases by defects, products, countries in Korea and some developed countries (USA and Japan mainly) in order to prepare for Product Liability, which will be enforced on July 1, 2002 in Korea. Before P.L. began to enforce, many cases have happened and resulted in sues. Therfore, each country have revised the current P.L. after many trials and errors. From this respect, the cases of other countries and Korea will be compared and analyzed.