Ship masters always pay attention to the ship condition such as draft and trim, stability and ship hull strength to maintain the safe navigation. It is considered that the stability of container ship is not so severe problem due to the introduction of Over Panamax type. Otherwise too large G_0M value causes the problems of securing of on deck containers due to the short rolling period. On this study the author focused on the actual ship data and intended to examine the difference between Panamax type and Over Panamax type ships and also the difference between similar Over Panamax type ships. By the result of statistic analysis of actual ship data the difference of index of G_0M, trim and ship hull strength of both ship types were clarified.
