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Due to more and more attentions having been paid on marine pollution emissions,nowadays the international maritime organization (IMO) and California Air Resources Board all release regulations and legislations to control coastwise exhaust pollutions from ships,especially SOx,which demands high sulfur content 3.5％ used in the open sea and low sulfur content 1.0％ (decline to 0.1％ till 2015) in emission controlled areas (ECA).Additionally,ship-owners always operate engines in the slower speed and lower engine load conditions aiming to decline fuel consumption to save operational costs,which make engine efficiency and combustion chamber temperature reduce.Consequently,cylinder oils should provide upper limit of base number up to 100BN and lower limit only around 30BN meeting the demands of variation of operational parameters and switchover of fuel oils.To solve this problem,Maersk Company firstly introduced Blender-on-Board system,in which system oil as base stock is blended with different dosages of additive package to make cylinder oil with optimal base number.This study was aimed to research and design the formula of BOB additive package,which has been demonstrated to satisfy the performance demands of cylinder oils with TBN from 30BN to more than 100BN.To maintain the requirements of modern marine diesel engines,especially at the condition of very low level of dosage,this BOB additive package shows better capacities to control deposit and resist friction and wear than the commercial reference from one of our competitors.