It is inevitable for sea water droplets splashing on surface of pipe during pipeline installation.In order to study the influence of lubrication of sea water droplets,a series of experimental tests were carried out in laboratory condition to investigate the static frictional behaviors of rubberpipe contact system under the three typical lubricating conditions,the whole contact lubrication,the front part lubrication and the tail edge lubrication.The results show apparently reduction on the level of static friction due to the lubrication of sea water.The whole contact lubrication has the best lubricating efficiency,while the influence of lubrication is more active when droplet propagates into the contact interfaces at tail edge than that at front edge.Sequences of captures of contact region facilitate to identify the evolutions of contact,and to analyze the principles of lubrication for the three lubricating conditions.It is shown that the adhesion force between interfaces of contact is weaken by sea water film which is entrapped in the contact region,and then the static friction force is decreased.The difference of lubricating efficiency between the two side parts of contact is mainly resulting from the different formations of sea water film.