The carbonaceous particulate or soot emission from diesel engines has become one of serious environmental problems in the world. There is no regulation on particulate emission from marine diesel engine at present. In the present report, experimental investigation was conducted with a two-stroke marine diesel engine to know the characteristics of particulate emission. Concentration of particulate emission was measured by three kinds of method, such as direct sampling method, partial-flow dilution tunnel method and Bosch type smoke meter method. The effects of engine load ratio and cylinder oil feed rate have been examined. The experimental results show that the particulate concentration measured by the dilution tunnel method increases with an increase in cylinder oil feed rate. The data points obtained by the direct sampling method and the smoke meter are somewhat scattered and the general tendency is not evident within the limits of this experiment.