This study used a two section type sampler for single particle sampling,analyzed the particle morphology,size,influencing factors of diesel engine particulate emission,and compared the characteristics with other diesel engines. It finally found:Chain particles are the primary number of diesel emissions with the ratio of 72%,the second is mineral particles,existing in two forms of single particle and adherent to secondary pollutants,with their sizes ranged mostly in 0.2~0.6 μm. The polygon particles are the main material in the surrounding atmospheric particles,mainly concentrated in the size of 0.3~0.5 μm. The number of particles gradually increased along with the loading of diesel engine, and the organic particles increased first and then decreased.