At present time, the environmental pollution of the world is one of the most urgent problem for all humanity. To reduce the pollution from the ships, there are many solutions to be used such as: modification of diesel engines, using bio-diesel fuel,... Using of bio-diesel as fuel for diesel engines was well-known, however the using bio-diesel fuel for the marine diesel engine also have been restricted, because of the technology of marine diesel engine or the other problems.

At present time, the climate change has been effecting on the over world. There are many reasons to make the climate changed including the emissions from the diesel engines equipped on board the ships. The International Maritime Organization through the Annex VI of the MARPOL 73/78 Convention strongly requests the all Governmental Parties to take a part in the reduce the emissions from their fleet to the atmosphere. However, how to reduce the emissions from the ships is always a rather difficult question for the whole government.