A particulate separation system that can be used to study the characteristics of the diesel particulate agglomeration and cyclone separation is developed It includes a diesel particulate agglomerator and a cyclone separator mainly A preliminary investigation on the cyclone separation tech nology for controlling the exhaust particulate from a diesel engine is conducted The experimental results show that the diameter distribution of the diesel particulate is changed after they pass through the agglomerator,almost 30%～40% o f the particulate agglomerated from less than 1.0μm to larger than 1.0μm ,this change contributes to trap diesel particulate With this system installed on the exhaust pipe of a single cylinder engine,the particulate separation efficiency is around 40%～60% under typical engine running condition The back pressure of this system is less than 5 kPa on full load condition,much less than that of other methods of particulate filtration This technology has the possibility to open a new prospect for particulate reduction because of its simplicity,reliability and low resistance. A particulate separation system that can be used to study the characteristics of the diesel particulate agglomeration and cyclone separation is developed it includes a diesel particulate agglomerator and a cyclone separator mainly A preliminary investigation on the cyclone separation tech nology for controlling the exhaust particulate from a diesel engine is conducted The experimental results show that the diameter distribution of the diesel particulate is changed after they pass through the agglomerator, almost 30% to 40% of the particulate agglomerated from less than 1.0 μm to larger than 1.0 μm, this change contributes to trap diesel particulate With this system installed on the exhaust pipe of a single cylinder engine, the particulate separation efficiency is around 40% ~ 60% under typical engine running condition the back pressure of this system is less than 5 kPa on full load condition, much less than that of other methods of particulate filtration This technology has the po ssibility to open a new prospect for particulate reduction because of its simplicity, reliability and low resistance.