Deposition of tar residue is a seasonal phenomenon because it is observed during monsoon season. Coastal line is a boundary line between land and water surface. It is important to study impact of oil tar ball pollution because this phenomenon produces a very damaging effect on the ecosystem of the beaches. Many studies reported effect of tar ball pollution on different beaches. This paper also includes the impact of oil spills on the coastal ecosystem of Alibaug but other effects like social and financial will not be analyzed.Large numbers of tourist visit to Alibaug beaches region. But in recent year,because of marine pollution and problems like oil spillage from ship accidents,Alibaug beaches also get affected by problems of tar ball pollution. Oil spill accidents are increases day by day because increase in transportation of oil through ships. One test is also included in this paper by compability with bituminous properties.This paper gives general information of oil spill pollution along Alibaugcoastline,from which, it is possible to adopt preventive measures to reduce number of oil spill accidents.