In this paper, experimental investigation was conducted with two marine diesel engines, such as high speed four-stroke engine and low speed two-stroke engine, to know the present condition and characteristics of particulate emission. Particulate matter collected on a sampling filter by dilution tunnel system was divided into SOF and ISF by Soxhlet extraction method. The results show that SOF concentration decreases and ISF increases as engine load becomes larger for the four-stroke engine. On the other hand, an increase in engine load promotes both SOF and ISF emission for the two-stroke engine. An analysis of SOF by gas chromatography suggests that cylinder lubrication has a significant effect on SOF concentration in the exhaust gas of the two-stroke engine.